If you’ve ever submitted the same DME claim to Medicare and Medicaid and gotten two completely different responses, you already know the truth: these are not the same program, and they don’t play by the same rules. One is federal. One is state-run. One pays predictably. The other changes depending on your zip code.

For DME suppliers and billing teams, mixing up the two is one of the fastest ways to lose revenue. This guide breaks down the real differences — coverage rules, documentation, prior authorization, reimbursement, and the specific traps that catch new billers off guard.

Quick Overview: Why Medicare and Medicaid Aren’t Interchangeable

Medicare is a federal health insurance program for people 65 and older, certain younger people with disabilities, and patients with End-Stage Renal Disease. The rules are uniform across the country, and DME claims are processed through one of four DME MACs (Medicare Administrative Contractors) based on the patient’s permanent address.

Medicaid is a joint federal-state program for low-income individuals. The federal government sets minimum standards, but every state designs and administers its own program. That means California Medicaid (Medi-Cal), Texas Medicaid, and New York Medicaid have different fee schedules, different prior auth rules, different covered items, and different claim submission portals.

“Treating Medicaid like Medicare is the single most common mistake I see new DME billers make. The rules look similar on the surface, but the consequences of missing a state-specific requirement are immediate denials.” — Common observation echoed across AAPC and HBMA billing communities.

Eligibility and Enrollment Differences

To bill Medicare for DME, your supplier company must:

• Be enrolled in PECOS (Provider Enrollment, Chain, and Ownership System)
• Hold a PTAN (Provider Transaction Access Number)
• Be accredited by a CMS-approved organization (ACHC, BOC, The Joint Commission, etc.)
• Maintain a $50,000 surety bond per location

Medicaid enrollment is separate and required for each state you serve. A DME supplier based in Florida that delivers to a Georgia patient must be enrolled in Georgia Medicaid before billing for that patient. Some states also require participation in Managed Care Organizations (MCOs) like Anthem, Molina, or Centene, each with its own contracting and credentialing process.

Key point for billers: A patient being “Medicaid-eligible” doesn’t mean you can bill them. Verify enrollment in the specific state plan and any MCO assignment before dispensing.

Coverage Rules and Medical Necessity

Medicare DME coverage follows a clear federal framework. To be covered, an item must:

1. Be durable (withstand repeated use)
2. Be used for a medical purpose
3. Be useless to someone who isn’t sick or injured
4. Be appropriate for use in the home
5. Have an expected lifetime of at least three years

Medicare publishes Local Coverage Determinations (LCDs) through the DME MACs that spell out exact coverage criteria for each category CPAP, oxygen, power mobility, hospital beds, and so on.

Medicaid coverage is broader in some ways and narrower in others. Many state Medicaid programs cover items Medicare won’t, like:

• Incontinence supplies (diapers, underpads) for adults
• Enteral nutrition with looser criteria
• Pediatric DME through EPSDT (Early and Periodic Screening, Diagnostic, and Treatment) benefits
• Augmentative communication devices
• Bath safety equipment in some states

But Medicaid often requires more aggressive medical necessity documentation and may cap quantities monthly (e.g., 200 incontinence briefs per month in one state, 150 in another).

Prior Authorization: Where the Programs Diverge Most

Medicare’s Required Prior Authorization List for DME is relatively short and well-defined. As of 2026, it includes specific power mobility devices, certain pressure-reducing support surfaces, lower limb prosthetics, and select orthoses.

Medicaid prior auth is a different universe. State programs commonly require PA for:

• Most items over a dollar threshold (often $500–$1,000)
• Any custom or rental equipment
• Repairs and replacements
• Items exceeding state-defined quantity limits
• Out-of-network suppliers

Real-world impact: A standard manual wheelchair (K0001) often ships from a Medicare supplier with no prior auth required. The same wheelchair for a Medicaid patient in many states requires a completed PA form, physician documentation, and 5–10 business days of processing time before delivery.

Documentation Requirements Compared

Both programs demand strong documentation, but the specific forms and standards differ.

Medicare requires:

• A Standard Written Order (SWO) before delivery
• Detailed medical records supporting necessity
• A face-to-face encounter within 6 months prior for many categories
• Specific testing (e.g., sleep study for CPAP, oxygen saturation for O2)
• Proof of Delivery (POD) with patient signature

Medicaid typically requires:

• A prescription with state-specific elements
• Letter of Medical Necessity (LMN) — often more detailed than Medicare’s SWO
• Prior authorization approval before delivery
• Recertification at intervals shorter than Medicare’s
• State-specific forms (Texas TMHP forms, Medi-Cal TARs, etc.)

Many experienced DME Billing Services maintain separate documentation checklists for each payer to avoid mixing requirements what passes Medicare won’t always pass Medicaid, and vice versa.

Reimbursement and Fee Schedules

Medicare publishes a DMEPOS Fee Schedule updated quarterly, with rates that vary by:

• HCPCS code
• Geographic area (rural vs. non-rural, CBA vs. non-CBA)
• Whether the item is rental or purchase
• Capped rental status

Medicare typically pays 80% of the allowed amount, with the patient (or secondary insurance) responsible for the remaining 20% plus any unmet deductible.

Medicaid reimbursement is almost always lower than Medicare for the same HCPCS code. A common pattern across states:

Figures are illustrative and vary by year, state, and rural adjustment. Always check current schedules.

For dual-eligible patients (those with both Medicare and Medicaid), Medicare pays first, and Medicaid may cover the 20% coinsurance — but only up to the Medicaid allowable, not the Medicare allowable. This is called the “lesser of” rule and routinely catches billers who expect full crossover payment.

Claim Submission and Timely Filing

Medicare DME claims go to one of four DME MACs based on the patient’s address:

• Jurisdiction A — Noridian (Northeast)
• Jurisdiction B — CGS (Midwest)
• Jurisdiction C — CGS (Southeast)
• Jurisdiction D — Noridian (West)

Claims must be filed within 12 months of the date of service.

Medicaid claims go to the state agency or assigned MCO. Timely filing limits vary widely:

• California (Medi-Cal): 6 months
• Texas Medicaid: 95 days
• New York Medicaid: 90 days in many cases
• Florida Medicaid: 12 months

Missing the Medicaid filing window is one of the most preventable causes of lost revenue. A claim that’s still well within Medicare’s 12-month limit may already be unrecoverable on the Medicaid side.

Common Pitfalls That Cost DME Suppliers Money

A short list of mistakes billing teams repeat across the country:

• Billing Medicaid before checking MCO assignment — claim auto-denies
• Using Medicare LCD criteria to justify a Medicaid claim — different standards apply
• Forgetting state-specific modifiers — Medicaid often requires modifiers Medicare doesn’t
• Submitting without prior auth on Medicaid — even when Medicare wouldn’t have required it
• Missing crossover claims for dual-eligibles — leaves the 20% coinsurance unpaid
• Skipping the recertification cycle on Medicaid rentals — payments stop without warning

Mini Case Study: How a CPAP Claim Plays Out

Consider a 67-year-old patient newly diagnosed with sleep apnea, dual-eligible for Medicare and Texas Medicaid, prescribed a CPAP (E0601).

Medicare side:

• Sleep study confirms AHI ≥ 5 with symptoms or AHI ≥ 15
• SWO signed before delivery
• 90-day compliance period begins
• Medicare pays 80% of monthly rental for 13 months, then patient owns the device

Medicaid (Texas) crossover:

• Texas Medicaid receives crossover claim automatically
• Pays the 20% coinsurance up to Texas Medicaid’s allowable
• If Texas Medicaid’s allowable is lower, pays only the difference
• If patient fails the 90-day Medicare compliance test, both programs stop paying, and the supplier eats the cost of the equipment retrieval

This is why experienced billers track compliance data daily during the first 90 days the financial exposure is real.

Final Takeaway for Billers

Medicare DME billing rewards process consistency. Once you know the LCD, the modifiers, and the documentation standard, you can scale that knowledge nationwide.

Medicaid DME billing rewards state-level expertise. You can’t shortcut it with a national playbook — you have to learn the specific state’s rules, its MCOs, its forms, and its quirks.

The suppliers and practices that handle both well typically do one of two things: they invest deeply in trained internal staff who specialize by payer, or they partner with DME Billing Services that already maintain payer-specific workflows. Either way, the goal is the same submit clean claims the first time, every time, and stop leaving money on the table because of a rule somebody didn’t know existed.

Master the differences, document like an auditor is watching, and the revenue takes care of itself.

Stay updated, free dental videos. Join our Telegram channel

Join