Official X12 description
“The procedure code/type of bill is inconsistent with the place of service.”
Source: X12 Claim Adjustment Reason Codes. The X12 External Code Lists are the single authoritative source for every CARC descriptor — always verify against the current release before building a claim-scrub rule.
What CARC 5 actually means
CARC 5 indicates the CPT/HCPCS billed is not valid for the Place of Service (POS) code submitted — for example, a facility-only procedure billed with office POS 11, or a surgical code billed with POS 21 (inpatient) when it should have been POS 22 (outpatient). Correct the POS or the procedure and rebill.
Common root causes
- Wrong POS on the professional claim (POS 11 vs 22 vs 24, or an inpatient POS on an outpatient encounter).
- Type-of-bill on an institutional claim not aligned with the facility type.
Prevention checklist
- POS validation against each CPT's payer-allowed POS list at charge entry.
- Institutional TOB scrubbing by facility type and claim use-case.
Appeal strategy — step by step
Most CARC 5 denials clear faster with the right remediation than with a formal appeal. Work the steps in order and escalate only when a lower-effort path has been ruled out.
- 1Correct the POS/TOB and submit a corrected claim — no narrative appeal needed.
Sample appeal-letter language for CARC 5
Edit the bracketed fields before sending. This template is a starting point; a payer-specific appeal form may still be required — check the provider portal first.
Payer-specific notes
Payer-specific behavior for CARC 5 publishes here as the QuickIntell anonymized denial ETL ingests sufficient volume. In the meantime, consult the payer directory for the relevant provider manual and appeal form.
How common is CARC 5?
Out of 306 seeded CARCs, ranked by combined US monthly search volume for "CARC 5", "CO-5 denial", and "denial code 5".
Platform frequency ranks publish once the anonymized denial-rate pipeline reaches the publication threshold (strategy §12 Phase 2).
How QuickRCM prevents CARC 5
QuickRCM catches the root causes above before the 837 leaves the clearinghouse:
- Claim-scrub rules fire on every root cause listed above — the scrub references the same X12 CAS segment logic that drives the denial, so what the payer checks, QuickRCM checks first.
- When a denial lands, QuickRCM routes it to the correct worker with the documentation bundle already attached (op note, LCD citation, modifier rationale, EOB, primary 835).
- Appeal templates tuned to each CARC (including this one) pull the supporting facts from the claim and fill the bracketed fields automatically.
CAQH CORE code combinations for CARC 5
Under the CAQH CORE Payment and Remittance Uniform Use rule, health plans may pair CARC 5 only with the remark codes and group codes below for the defined business scenario 3 (Billed service not covered by the health plan). A combination outside this list on an 835 is itself a payer compliance issue worth raising.
| RARC | Remark description | Group code | Scenario |
|---|---|---|---|
| (no RARC) | CARC used without a remark code | CO, PI or PR | 3 |
| M77 | Missing/incomplete/invalid/inappropriate place of service. | CO, PI or PR | 3 |
| MA109 | Claim processed in accordance with ambulatory surgical guidelines. | CO, PI or PR | 3 |
| N428 | Not covered when performed in this place of service. | CO, PI or PR | 3 |
The rule behind CARC 5
CARC 5 means the procedure code or type of bill does not fit the place of service. Check the code on the claim against the CMS place of service list and the patient's registration: a registered hospital inpatient or outpatient is reported with at least POS 21, or POS 19 or 22, wherever the visit took place. On telehealth claims Medicare accepts only POS 02 and POS 10.
Frequently asked questions — CARC 5
What does CARC 5 mean?
CARC 5 is an X12 Claim Adjustment Reason Code. The official definition is: "The procedure code/type of bill is inconsistent with the place of service." In plain English, the payer is telling you cARC 5 indicates the CPT/HCPCS billed is not valid for the Place of Service (POS) code submitted — for example, a facility-only procedure billed with office POS 11, or a surgical code billed with POS 21 (inpatient) when it should have been POS 22 (outpatient). Correct the POS or the procedure and rebill.
How do I resolve a CARC 5 (CO-5) denial?
Start with the most common root cause: Wrong POS on the professional claim (POS 11 vs 22 vs 24, or an inpatient POS on an outpatient encounter). First step: Correct the POS/TOB and submit a corrected claim — no narrative appeal needed. See the full remediation and appeal checklist on this page before filing a formal appeal.
Is CARC 5 patient responsibility?
No — CARC 5 is typically carried under CO (Contractual Obligation) or OA (Other Adjustment), which means it is the provider's responsibility, not the patient's. Do not bill the patient unless the 835 CAS group code is PR.
What does CARC 5 look like on an EOB or 835 remittance?
On the 835 ERA, CARC 5 appears in Loop 2110 CAS segment as "CAS*CO*5*{amount}". On a paper EOB the same code prints in the Adjustment/Denial Reason column with the X12 description: "The procedure code/type of bill is inconsistent with the place of service." — usually paired with one or more RARC remark codes in the same remittance line for additional context.
Which RARC is paired with CARC 5?
CARC 5 is commonly observed with RARC M77. The RARC narrows the reason — for example, pointing at a missing modifier, an LCD citation, or a specific policy. Fix the underlying CARC first; the RARC usually clears with the corrected claim.
Disclaimer
This page is operational reference for medical-billing professionals. It is not legal, clinical, or contractual advice. X12 code descriptors are maintained by the X12 External Code Lists; always verify against the current X12 release and the payer's own published policy before submitting or appealing a claim.