E0601
CPAP device
- Specialty
- CPAP / PAP Supplies
- Publication
- verified
- Fee reference
- Available
- Documentation
- Required
Independent, free, source-backed education
Medical Billing and Medicare Reimbursement
Learn billing rules, resolve denials, research claims, and trace simplified guidance back to current official sources.
Start with the work in front of you
Direct paths for billing, coding, denial, and reimbursement work.
22 lessons22 denial guides
Resolve a denial
CARC and RARC research, root cause, correction, reopening, appeal, and prevention.
Learn medical billing
Free structured tracks for claims, coding, payment, denials, and Medicare compliance.
Find a billing rule
Claim forms, NCCI, MUE, modifiers, POS, filing, authorization, MSP, and ABNs.
Look up an HCPCS code
Coverage status, documentation, modifiers, fee references, and official sources.
Check a DME fee
Official July 2026 DMEPOS state and rural or non-rural fee rows.
Research a DME claim
De-identified coverage, DME MAC, fee, documentation, and risk brief.
Free University
Learn the full claim, not isolated codes
Progress from fundamentals to advanced coding edits, denial resolution, appeals, and Medicare compliance.
Open UniversityBilling Fundamentals
Claims, code sets, eligibility, privacy, clean-claim controls, and payment basics.
Professional Claims
CMS-1500, 837P, place of service, provider roles, and professional claim logic.
Institutional Claims
CMS-1450, 837I, type of bill, revenue lines, and institutional data relationships.
Coding Rules
NCCI PTP, MUE, distinct-service modifiers, units, and code-set discipline.
Denials and Appeals
Remittance interpretation, root-cause triage, correction, reopening, and appeal workflow.
Medicare Compliance
Timely filing, prior authorization, MSP, ABNs, enrollment, and documentation.
DME Reimbursement
HCPCS, DME MACs, coverage, orders, delivery, rental, replacement, and fee research.
Common questions
High-intent billing rules
CARC and RARC Denial Codes Explained
The group code assigns the adjustment category, the CARC gives the general reason, and RARCs add detail. Read the full combination at claim and line level before deciding who owns the balance or what to do next.
Medicare Timely Filing Limit and Exceptions
Original Medicare generally requires a claim to reach the correct contractor no later than 12 months, or one calendar year, after the applicable date of service. A timely-filing denial is generally not an initial determination and is not appealable.
Modifier 59 vs XE XP XS XU for NCCI Edits
Modifier 59 is a last-resort distinct procedural service modifier. CMS directs use of a more specific XE, XP, XS, or XU modifier when it accurately describes the documented relationship.
How Medicare NCCI PTP Edits Work
A Medicare NCCI PTP edit identifies code pairs that generally should not be paid together for the same beneficiary and date. The Column Two code denies unless the edit permits a modifier and the clinical facts support a valid exception.
How to Complete a CMS-1500 or 837P Claim
The 837P is the standard electronic professional claim. CMS-1500 is the paper form used when an allowed paper-claim exception applies; both represent the same claim story through different formats.
Medical Prior Authorization Process and Denial Checklist
An approval number alone is not enough. The authorization must match the patient, payer, plan, provider, service, setting, quantity, and service dates that appear on the claim.
Payment follow-up
Denial code resolution
CARC 16: Missing or Invalid Claim InformationClaim dataCorrect and resubmitCARC 18: Duplicate Claim or ServiceDuplicate billingPayer inquiryCARC 22: Coordination of Benefits and Payer OrderCoordination of benefitsCorrect and resubmitCARC 29: Timely Filing DenialFiling deadlinePayer inquiryCARC 97: Service Included in Another PaymentBundling and coding editsContractual reviewCARC 109: Claim Sent to the Wrong Payer or ContractorPayer routingCorrect and resubmit
Specialty intelligence
Verified PAP and DME reimbursement records
Coverage, documentation, frequency, modifier, policy, and official CMS DMEPOS fee research.
conditional
E0470
Respiratory assist device, bilevel pressure capability, without backup rate
- Specialty
- CPAP / PAP Supplies
- Publication
- verified
- Fee reference
- Available
- Documentation
- Required
E0471
Respiratory assist device, bilevel pressure capability, with backup rate
- Specialty
- CPAP / PAP Supplies
- Publication
- verified
- Fee reference
- Available
- Documentation
- Required
E0562
Heated humidifier
- Specialty
- CPAP Accessories
- Publication
- verified
- Fee reference
- Available
- Documentation
- Required
A4604
Heated tubing
- Specialty
- CPAP Accessories
- Publication
- verified
- Fee reference
- Available
- Documentation
- Required
A7027
Combination oral/nasal mask
- Specialty
- CPAP Masks
- Publication
- verified
- Fee reference
- Available
- Documentation
- Required
| HCPCS | Description | Specialty | Coverage | Documentation | Rental/Purchase | Fee Reference | Research Status | Confidence | View |
|---|---|---|---|---|---|---|---|---|---|
| E0601 | CPAP device | CPAP / PAP Supplies | conditional | Required | capped rental | Available | verified | Verified | Open |
| E0470 | Respiratory assist device, bilevel pressure capability, without backup rate | CPAP / PAP Supplies | conditional | Required | capped rental | Available | verified | Verified | Open |
| E0471 | Respiratory assist device, bilevel pressure capability, with backup rate | CPAP / PAP Supplies | conditional | Required | capped rental | Available | verified | Verified | Open |
| E0562 | Heated humidifier | CPAP Accessories | conditional | Required | rental or purchase | Available | verified | Verified | Open |
| A4604 | Heated tubing | CPAP Accessories | conditional | Required | supply | Available | verified | Verified | Open |
| A7027 | Combination oral/nasal mask | CPAP Masks | conditional | Required | supply | Available | verified | Verified | Open |
Source policy
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