Your complete guide to durable medical equipment.
A physician's order is the beginning, not the end. This page explains what Medicare covers, what it doesn't, how to get what you need, why suppliers operate within specific rules, and what your rights are when something goes wrong.
Not everything a physician orders is DME. Medicare's definition comes from the Social Security Act, and an item must meet all five criteria to qualify for Part B coverage — regardless of how medically important it is.
Bath safety equipment — shower chairs, grab bars, raised toilet seats — fails criteria 2 and 3. Medicare classifies these as convenience items and does not cover them under Original Medicare or any Medigap supplement. Medicaid, Medicare Advantage, and the VA have separate rules that may cover them depending on individual eligibility.
| Code prefix | Category | Examples |
|---|---|---|
| E codes | Durable medical equipment | Hospital beds (E0250), standard wheelchairs (E0950), walkers (E0130), CPAP (E0601), oxygen (E1390) |
| K codes | Complex rehab technology and SNF DME | Power wheelchairs (K0813–K0864), custom manual chairs (K0004–K0009) |
| L codes | Orthotics and prosthetics | AFO (L1900), spinal brace (L0100), lower limb prosthesis (L5000) |
| A codes | Medical and surgical supplies | Wound dressings (A6196), intermittent catheters (A4351), ostomy supplies (A4361) |
| B codes | Enteral and parenteral nutrition | Feeding tube supplies (B4081), enteral formula (B4149) |
Coverage status is not simply yes or no. Some items are covered outright. Others require specific diagnoses, documented clinical criteria, or prior authorization. The conditions matter as much as the coverage determination itself.
This section describes Original Medicare (Parts A and B) coverage. Medicaid may cover additional items — including some not covered by Medicare — for income-eligible individuals, but what is covered and the eligibility rules vary by state. Medicare Advantage plans must cover at least what Original Medicare covers but may add benefits or impose additional prior authorization requirements. Always verify with the specific plan.
These exclusions have specific legal and policy bases. Understanding why an item is not covered helps identify whether there is an alternative path through Medicaid, Medicare Advantage, or other programs.
For individuals who qualify for both Medicare and Medicaid (dual eligibles), Medicaid is frequently the payer for items Medicare does not cover — incontinence supplies, bath safety equipment in some states, home modifications under HCBS waivers, and certain additional DME categories. Eligibility criteria, covered items, and quantity limits vary significantly by state. Contact your state Medicaid agency or a SHIP counselor to determine what applies in your state.
Select your state to see what Medicaid covers where you live →Between a physician writing an order and equipment arriving at home, several steps are controlled by different parties. Understanding the sequence prevents weeks of confusion about why nothing has arrived.
A physician's written order establishes clinical intent. It does not establish Medicare coverage, trigger automatic delivery, allow purchase from any store, or guarantee that what the physician specified matches what Medicare will approve. Each of those outcomes requires separate steps.
The physician writes a standard written order specifying the item, diagnosis code, and medical necessity. For complex rehab technology, a detailed face-to-face examination note is required. For CPAP, the qualifying sleep study results must be on file. The specificity of this documentation directly affects how smoothly the subsequent steps proceed.
A complete order includes: patient name and date of birth, item description or HCPCS code, diagnosis code, prescribing physician name, address, NPI, signature, and date. An incomplete order is returned for correction — this adds days to the timeline.
What the order does not do: It does not contact a supplier, trigger delivery, or constitute a coverage determination. Medicare and the supplier make coverage determinations separately from the physician's clinical decision.
Confirm two things before committing to a supplier: (1) the supplier is enrolled in Medicare as a DMEPOS supplier, and (2) the supplier accepts Medicare assignment. Accepting assignment means the supplier accepts Medicare's approved rate as full payment and cannot charge more than the standard 20% coinsurance. A non-participating supplier may charge up to 15% above Medicare's approved amount.
Hospital discharge: The discharge planner may suggest a specific supplier. Patients are not required to use that supplier. Any Medicare-enrolled supplier who accepts assignment and can provide the item in the patient's geographic area is eligible. State the preference before discharge.
Medicaid dual eligibles: Patients covered by both Medicare and Medicaid need to confirm the supplier accepts both. For dual eligibles, Medicare is the primary payer and Medicaid may cover the remaining cost-sharing — but only if the supplier is enrolled in both programs. A supplier enrolled in Medicare only cannot bill Medicaid for the 20% coinsurance.
The supplier verifies Medicare eligibility, confirms the item falls within a covered benefit category, and determines whether prior authorization is required. For standard DME without prior authorization requirements, processing proceeds to delivery scheduling. For CPAP, power wheelchairs, complex rehab technology, and certain wound care items, prior authorization must be obtained before delivery.
Ask the supplier: Has the order been entered into your system? Has prior authorization been submitted if required? What is the expected delivery date? If a supplier cannot provide a delivery estimate within 48 hours of receiving a complete order, ask for a status update directly.
For items requiring prior authorization, the supplier submits a documentation packet to the DME MAC for the patient's region. The MAC has 10 business days for standard review. An Additional Documentation Request resets the clock. Approval allows the process to proceed; denial begins the appeals process.
Ask for the authorization reference number and submission date. If the supplier cannot provide both immediately, the authorization has not been submitted. "It is being processed" is not a trackable status — a submitted authorization has a reference number.
If delay creates a genuine health risk, the physician can document medical urgency and request an expedited review, which must be decided within 72 hours.
Equipment is delivered to the patient's home. Hospital beds and complex wheelchairs require technician setup. CPAP and respiratory equipment require instruction from a respiratory therapist or trained technician. The delivery date is documented — for most DME, this is when the 5-year Reasonable Useful Lifetime clock begins.
Keep all delivery paperwork. The delivery date controls the replacement timeline. Proof of delivery may also be requested if the claim is audited.
Medicare reimburses to a HCPCS code — not to a brand name or specific model. A physician who writes "Brand X power wheelchair" is expressing a clinical preference. Medicare pays for the code that corresponds to the appropriate product group. Multiple products from different manufacturers can bill under the same code. The supplier provides an item that meets the code's specifications at the fee schedule rate.
If the supplier's product genuinely does not meet the clinical requirements documented by the physician — wrong dimensions, missing required components, incompatible controls — that is a legitimate clinical issue. The physician should specify required functional features in the documentation rather than a brand name. Required functional features that meet coverage criteria must be provided.
1. Document the clinical need for the higher-tier item through prior authorization. If the patient's condition genuinely requires more capability than a lower-tier item provides, the physician's documentation should state why — specifically and in functional terms. An adequately documented clinical need can support a higher-tier item through the standard prior authorization process.
2. The ABN and upgrade path. CMS regulations allow suppliers to provide an upgraded item above what Medicare covers if the patient signs an Advance Beneficiary Notice agreeing to pay the difference. In practice, most suppliers do not offer this due to billing complexity and compliance considerations. If a supplier is willing to do this, it is a valid option. This is not a service failure — it reflects the operational constraints of most DME suppliers.
3. Private purchase outside Medicare. A patient may purchase any item privately. Medicare cannot prevent this. Medicare will not retroactively reimburse private purchases. If the patient later seeks a Medicare-covered item for the same need, the standard process applies from the beginning.
A supplier may be unable to bill Medicare for a specific item in a specific area for several legitimate reasons: the supplier may not have the required Medicare enrollment category for that item type; or the item may fall under a competitive bidding contract in that area and only contracted suppliers are eligible to bill.
During the current gap period (January 2024 through end of 2027), no active competitive bidding contracts are in force for any of the 16 previously covered categories. Most enrolled suppliers can currently bill for most items. When the next round begins in January 2028 for seven new categories — CGMs, insulin pumps, urological supplies, ostomy supplies, and three OTS brace categories — access will again be restricted to contracted suppliers in those categories.
If a supplier cannot provide an item, ask for the specific reason. Use Medicare's supplier directory at medicare.gov or call 1-800-MEDICARE to find enrolled suppliers in the area.
Medicare sets specific quantity limits on consumable supplies based on clinical utilization standards. These limits are not individual assessments — they reflect standard clinical practice for a typical presentation. Quantities above the standard require a revised physician order with documented clinical justification.
State Medicaid programs often cover consumable supplies that Medicare does not — particularly incontinence briefs, underpads, and some wound care supplies — and in some cases at different quantity limits. For dual-eligible individuals, Medicare is billed first for items it covers. Medicaid may cover the Medicare cost-sharing and may separately cover items Medicare excludes. The specific items covered and the quantity limits vary by state.
Medicare's LCD L33831 sets coverage criteria for each dressing type based on wound stage, exudate level, and change frequency. Allowed quantities per month are determined by wound dimensions, dressing type, and the number of dressing changes per day or week permitted under coverage guidelines for that wound stage. No more than a one-month supply of dressings may be provided at one time. A new physician order is required every 3 months for each dressing type.
If wound status changes — wound enlarges, drainage increases, a new wound develops — a new physician order is required immediately to reflect the updated clinical picture. Suppliers cannot ship quantities beyond what the current order authorizes.
When supplies run out before month end: Contact the physician immediately. A revised order documenting the current wound status is needed before the supplier can ship more. Contact the supplier with the revised order as soon as it is available. Do not wait until supplies are completely exhausted — call when approximately 3–5 days of supplies remain.
Medicare covers up to 200 intermittent catheters per month, based on a standard of up to 6–7 catheterizations per day. The order quantity must reflect the patient's actual catheterization frequency. If the order documents 4 times daily but the patient catheterizes 6 times daily, the authorized quantity is insufficient and a revised order is required.
Drainage bags, leg bags, and extension sets have separate quantity limits and are not automatically included — patients need to confirm which accessory components are on the order and request them specifically. Medicaid covers urological supplies for eligible individuals; quantity limits and covered item types vary by state.
Medicare covers a defined monthly quantity of ostomy wafers and pouches based on ostomy type (colostomy, ileostomy, urostomy) and pouch system type. The allotment is calculated to cover standard wear time and standard daily use patterns. If stoma characteristics change — dimensions, shape, or output type — a new physician order with updated specifications is required before the supplier can ship a different product.
Accessory supplies — barrier rings, stoma paste, adhesive remover, deodorant — are covered in specified quantities separately. Patients who do not request these items may not be receiving them. Ask the supplier specifically which accessories are on the current order. Medicaid covers ostomy supplies for eligible individuals; state programs often have similar or broader coverage than Medicare for this category.
Medicare's replacement schedule for CPAP accessories: full face or nasal mask — one every 3 months; mask cushions or pillows — two per month; tubing — one every 3 months; disposable filters — two per month; non-disposable filters — one every 6 months; heated humidifier — one per year; chin strap — one every 6 months. Oxygen supplies (nasal cannulas, tubing, masks, humidifier bottles) are replaceable on a monthly schedule under similar rules.
Most suppliers do not automatically ship replacement supplies — the patient must contact the supplier to request them within the allowed schedule. Supplies can be requested as frequently as the schedule allows. A degraded mask or cracked tubing affects therapy effectiveness.
Enteral formula is shipped in the quantity prescribed, calculated from the prescribed volume per day. If the patient's nutritional needs change — weight, metabolic status, tolerance — a new physician order with revised formula type and volume is required before the supplier can change the product or quantity.
Delivery supplies (tubing, bags, extension sets) are included based on prescribed use frequency. If a different formula is received than what was ordered, contact the supplier directly. The physician specifies the formula type and caloric density — suppliers are not authorized to substitute without a revised order.
Most Medicare DME begins as a rental and transitions to patient ownership. The rules governing when equipment can be replaced, repaired, or upgraded are specific — and frequently misunderstood.
The Reasonable Useful Lifetime (RUL) for most DME is a minimum of 5 years under 42 CFR §414.210(f), measured from the delivery date. During this period, Medicare covers repairs up to the cost of replacement for equipment the patient owns. Replacement of equipment that has worn out through normal use is not covered during the RUL — that is the policy's intended function.
After the 5-year RUL, a patient may elect to receive a replacement item if it is still medically necessary and the item is worn beyond serviceability. A new physician order reaffirming medical necessity is required.
The 5-year period is a floor, not an absolute. CMS and DME MACs can establish different RUL periods for specific items through program instructions. Verify the RUL for the specific item in question.
1. Loss or theft. Covered at any time with documentation — a police report, insurance report, or a beneficiary statement describing the circumstances. The replacement must be the same or a nearly identical item.
2. Irreparable damage from a specific event. If equipment is damaged beyond repair by a specific accident, fire, flood, or natural disaster — not accumulated daily wear — Medicare covers replacement. Damage must be traceable to a specific identifiable event. Documentation should describe the incident specifically.
3. Change in medical condition. If the patient's condition has changed and the current equipment no longer meets the clinical need, this supports a new order for a different item. This is not technically a replacement — it is a new medical necessity claim. It requires updated physician documentation of the changed condition and how the existing equipment is now inadequate. This follows the standard prior authorization process for the new item.
CMS defines replacement as the provision of an entirely identical or nearly identical item (IOM Publication 100-02, Chapter 15, Section 110.2.C). Medicare will cover replacing a manual wheelchair with another manual wheelchair. It will not cover replacing a manual wheelchair with a power wheelchair as a "replacement" — that is a new claim requiring new medical necessity documentation and, for a power wheelchair, prior authorization.
The same principle applies across all categories: a Group 1 power wheelchair that has reached its RUL is replaced with another Group 1 chair, not with a Group 3, unless the patient's condition has changed and new documentation supports the higher group. A changed-condition claim requires a new physician evaluation, a new ATP evaluation for complex rehab technology, and new prior authorization — starting the full timeline over.
The same-or-similar check: Before a replacement claim can be approved, Medicare verifies the patient does not already have a same or similar item within its RUL. This is a common denial cause when a patient switches suppliers and the new supplier is unaware of the existing equipment. Suppliers should verify this before submitting a replacement claim.
The Benefits Improvement and Protection Act of 2000 amended the Social Security Act (§1834(h)(1)(G)) to require Medicare payment for replacement of prosthetic devices (artificial limbs) without regard to continuous use or useful lifetime restrictions, when the ordering physician determines replacement is necessary. The qualifying reasons include: a change in the patient's physiological condition; an irreparable change in the condition of the device or a part of it; or a condition where repair is not cost-effective. The physician's clinical determination controls — the 5-year clock does not.
DME suppliers operate within a system of rules, fee schedules, and billing constraints that most patients have not encountered before. When a supplier seems limited or unable to provide what was requested, it is almost always because of these structural constraints — not unwillingness to help.
Congress established the DMEPOS Competitive Bidding Program (MMA 2003) to replace fixed fee schedule payments with a competitive bid process for selected categories. Suppliers bid to become contracted providers. Only winning contract suppliers can bill Medicare for those items in their designated areas during the contract period.
Current status (2026): All Round 2021 competitive bidding contracts expired December 31, 2023. There are currently no active competitive bidding contracts in force for any of the 16 previously covered categories. This gap period continues until the next round begins. Most enrolled suppliers can currently bill for most items without competitive bidding restrictions.
Next round: CMS finalized a new rule in December 2025. The next round begins January 1, 2028, covering seven product categories as national remote item delivery programs: Class II CGMs and insulin pumps, urological supplies, ostomy supplies, OTS upper extremity braces, OTS knee braces, and OTS back braces. Oxygen, CPAP, standard mobility equipment, hospital beds, walkers, and enteral nutrition are not included in this round.
When the next round begins, patients using items in those seven categories will need to transition to contract suppliers within 6 months if their current supplier does not win a contract.
Participating supplier (accepts assignment): The supplier accepts the Medicare-approved amount as full payment. They bill Medicare 80%; the patient pays the 20% coinsurance (plus any applicable deductible). With Medigap Plan G, the patient's 20% is covered — out-of-pocket cost for covered items from a participating supplier is essentially the plan premium only.
Non-participating supplier (does not accept assignment): The supplier can charge up to 15% above Medicare's approved amount. Medicare pays 80% of the approved amount — not 80% of the higher charge. The patient pays the 20% coinsurance plus the excess charge. Confirm a supplier accepts assignment before proceeding. Ask directly: "Do you accept Medicare assignment?"
For dual-eligible patients: Medicaid typically covers the Medicare cost-sharing (the 20% coinsurance) for enrolled items, but only at Medicare-participating suppliers. If the supplier does not accept assignment, Medicaid will generally not cover the excess charge above Medicare's approved amount.
The Advance Beneficiary Notice of Noncoverage is a standard federal form. When a supplier presents one, it means they believe Medicare may not pay for what you are about to receive. Understanding the options before signing prevents unexpected bills.
An ABN reflects the supplier's prediction that Medicare may deny the claim — not a Medicare decision. Suppliers can be incorrect. If the item is medically necessary and the documentation supports coverage, selecting Option 1 allows the claim to proceed. If Medicare approves, only standard cost-sharing applies. If Medicare denies, the patient is responsible for the cost but retains appeal rights.
Ask the supplier to state the specific reason for the ABN. "Medicare may not cover this" is not a specific reason. The ABN must state a specific basis — insufficient documentation, frequency limit exceeded, coverage criteria not met. The specific reason identifies whether the issue is correctable (update documentation, obtain a revised order) or whether the item genuinely falls outside Medicare coverage.
If a supplier issues a blanket ABN without a specific reason, or presents one before verifying coverage, that is inconsistent with CMS supplier standards. Contact your DME MAC if this occurs.
CMS regulations allow a supplier to provide an item above what Medicare covers and collect the difference from the patient through the ABN process, using specific upgrade billing modifiers. The patient pays the difference between the supplier's charge for the upgraded item and Medicare's approved amount for the covered item, plus the standard 20% coinsurance on the covered portion.
In practice, most suppliers do not offer this path. The billing complexity, compliance audit risk, and operational constraints of most DME operations make it impractical. This is not a failure to provide a service the supplier is required to offer — it reflects structural limitations. If a patient needs something above what Medicare covers, the practical options are: document the clinical need and pursue prior authorization for the higher-covered item, or purchase the item privately outside Medicare.
When a patient enrolls in hospice, the equipment model changes fundamentally. The hospice becomes responsible for equipment related to the terminal diagnosis. The supplier relationship, billing process, and cost-sharing all shift.
The hospice benefit covers all equipment, supplies, and medications related to the patient's terminal diagnosis and its palliation. For a patient on hospice for end-stage COPD: the hospice provides oxygen, nebulizer, hospital bed, wheelchair, and related medications — all covered under the hospice per diem at no cost to the patient.
Equipment for conditions unrelated to the terminal diagnosis continues under Original Medicare Part B. If the same patient has a CPAP for sleep apnea unrelated to the terminal diagnosis, that CPAP continues under their existing DME supplier and Part B, not under hospice. This split can create confusion when both the hospice supplier and the standard DME supplier are delivering items to the same address.
When a patient enrolls in hospice mid-rental: If the patient was renting a hospital bed through a standard DME supplier and enrolls in hospice, the hospice will arrange their own bed through their contracted supplier. The existing rental should be terminated — the DME supplier retrieves their equipment and the hospice provides a replacement. This transition should be coordinated among the DME supplier, the hospice, and the family.
Under the Medicare hospice benefit, there is no patient cost-sharing for covered hospice equipment and supplies — no copays, coinsurance, or deductibles. The hospice receives a daily per diem from Medicare that covers all necessary equipment and supplies related to the terminal diagnosis. If a hospice is billing the patient or family for equipment or supplies that are related to the terminal diagnosis, contact the hospice billing department to request a specific explanation and the CMS benefit category the charge falls under.
Situations where costs may legitimately arise: equipment the hospice's medical director does not consider related to the terminal diagnosis (separately covered under Medicare Part B); non-hospice general medical care the patient has elected to continue for unrelated conditions. Both should be explained clearly before charges are issued.
All equipment provided by the hospice is retrieved by the hospice or their contracted supplier after the patient's death. The hospice coordinates this — the family does not need to arrange it. Pickup typically occurs within 1–3 days and the hospice contacts the family to schedule it.
Equipment the patient owned before entering hospice belongs to the patient's estate. A wheelchair purchased before hospice enrollment, a CPAP continuing under Part B for an unrelated condition — the family handles this as personal property. It does not need to be returned unless it was still on active Medicare rental.
Medicare beneficiaries have specific, enforceable rights in the DME process. A denial is the beginning of a process, not the conclusion of one.
Read the denial notice before taking any action. The reason code identifies what went wrong. If the denial is for insufficient documentation, submitting the specific missing clinical information at Level 1 redetermination frequently resolves it. If the denial is for a service that is genuinely outside Medicare's coverage, the appeals process will not change that outcome — and recognizing that distinction determines where to focus effort.
Equipment coverage is navigable when you understand how it works.
Your state affects what Medicaid programs, supplemental benefits, and resources are available to you. Select yours to see what applies where you live.