What Is a Clean Claim in Medical Billing?

A clean claim is a claim the payer can process without asking the practice, or anyone else, for more information. Medicare defines it as a claim that its contractor doesn't need to investigate or develop outside its own Medicare operation before paying, and it must be filed within the timely filing period. The federal Medicaid rule is similar: a clean claim can be processed without obtaining additional information from the provider or a third party.

"Clean" doesn't mean "paid". A clean claim can still be denied, for example because the service isn't covered. What it means is that the payer can make a decision without holding the claim for missing or wrong information. Commercial plans define clean claims in their contracts and under state prompt-pay laws, so check the definition in each contract you hold.

Why does a clean claim matter?

The shortest payment deadlines apply to clean claims.

• Medicare must pay or deny a clean claim within 30 days of receiving it, and owes interest when it pays late. It also can't pay before a waiting period of 13 days for an electronic claim (26 for paper).
• Medicaid agencies must pay 90% of clean claims from practitioners within 30 days of receipt, and 99% within 90 days.

A claim that isn't clean isn't covered by those deadlines (Medicaid, for example, allows up to 12 months for other claims). Medicare calls it an "other" claim: one that needs development, such as a request for records, information from another contractor or questions about other insurance. A claim with missing or invalid required information may instead be returned as "unprocessable". Medicare doesn't treat a returned claim as a claim at all, so it isn't denied and has no appeal rights. It has to be corrected and sent again, and the timely filing limit keeps applying.

Is a rejected claim the same as a denied claim?

No, and the difference changes what you do next.

• A rejection happens before the payer adjudicates the claim. The clearinghouse or payer front end refuses it because data is missing, invalid or in the wrong format. The fix is to correct the data and resubmit.
• A denial is a decision after adjudication. It comes back on the remittance advice with a claim adjustment reason code (CARC) and, often, a remark code. A denial is corrected or appealed, depending on the reason.

A claim that goes through both stages without either is a claim that went out clean.

What does a clean claim contain?

This checklist follows the fields and edits that most often turn a claim unclean. The reason codes in brackets are the X12 CARCs a payer typically uses when that item is wrong. Payers choose the code, so what you see may differ.

• Patient and subscriber details that match the payer's records. Name, date of birth, member ID and the subscriber relationship. [CARC 31: patient can't be identified as the payer's insured]
• Coverage that is active on the date of service. [CARC 27: expenses incurred after coverage ended]
• The right payer, in the right order. If the patient has more than one plan, the primary plan is billed first. [CARC 22: may be covered by another payer per coordination of benefits; CARC 109: not covered by this payer, send to the correct one]
• Valid provider identifiers. The rendering, billing and, where required, referring or ordering provider's NPI. Medicare returns a claim with a missing or invalid NPI as unprocessable.
• Codes the documentation supports. Current ICD-10-CM, CPT and HCPCS codes, at the level the record supports: not higher, not lower.
• A diagnosis linked to each service that explains why it was done. [CARC 11: diagnosis inconsistent with the procedure]
• Modifiers only where the documentation supports them. [CARC 4: procedure code inconsistent with the modifier]
• Code pairs and units that pass NCCI. CMS's procedure-to-procedure edits catch incorrect code combinations, and its medically unlikely edits catch units above the usual limit. [CARC 97: bundled into another service; see the CO-97 guide]
• A prior authorization number where the plan requires one. [CARC 197: authorization absent]
• Attachments or records where the payer's policy asks for them up front. [CARC 16: claim lacks information, usually with a remark code saying what]
• Filed within the payer's time limit. Medicare's is generally 1 calendar year after the date of service. [CARC 29: time limit for filing has expired]

How do you submit clean claims consistently?

1. Verify at the front desk, every visit. Check eligibility and benefits before the visit, confirm the primary payer, and record any authorization or referral.
2. Code from the record. Code only what is documented. When the documentation is unclear, send a query to the clinician rather than guessing.
3. Scrub before you submit. Run every claim through edits for required fields, code validity, NCCI pairs and units, and the payer rules you've learned from past denials.
4. Work rejections the same day. A rejected claim isn't in the payer's system. Until it is fixed, the filing deadline is still running.
5. Close the loop. Group denials by reason code and fix the step that produced them. The HHS Office of Inspector General's compliance guidance for physician practices recommends exactly this: review the practice's denial history and correct the most frequent sources of denials.
6. Keep people current. Code sets change: new ICD-10-CM codes take effect each October 1, and payer policies change during the year.

How do you measure clean claims?

Practices usually track a clean claim rate or first-pass rate: the share of claims accepted, or paid, on first submission without correction. There is no single standard definition, so write down which one you use (accepted, or paid; by claim, or by line) and apply it consistently month to month. A published benchmark is only useful if it uses the same definition as yours. The medical billing KPIs guide covers related measures.

How do clean claims relate to denials?

A clean claim removes the preventable, data-driven reasons for delay. It doesn't remove coverage or medical-necessity decisions. The guide to why insurance claims get denied covers the full list of denial reasons, and common medical billing mistakes looks at the workflow gaps behind them.

If you want a second pair of eyes on how your claims are prepared and checked, Highview's medical billing team can start with a free call about your current workflow.

Sources

• CMS, Medicare Claims Processing Manual, Chapter 1: §70 (timely filing), §80.2 (definition of a clean claim), §80.2.1.1 (payment ceiling), §80.2.1.2 (payment floor), §80.3 (other claims), §80.3.1–80.3.2 (unprocessable claims).
• eCFR, 42 CFR 447.45: Medicaid clean claim definition and timely payment.
• eCFR, 42 CFR 424.44: Medicare time limits for filing claims.
• X12, Claim Adjustment Reason Codes.
• CMS, National Correct Coding Initiative edits.
• CMS, ICD-10 codes: ICD-10-CM effective dates.
• HHS-OIG, Compliance Program for Individual and Small Group Physician Practices (65 FR 59434, October 5, 2000).