Use this as a pre-submission checklist. Each item lists the remittance code you'll usually see (CARC) and what to check before the claim leaves the office. Print it, share it, adapt it to your payers.
1. Medical necessity not met (CO-50)
Epidurals, facet injections and RFA are tied to coverage criteria: duration of pain, failed conservative care, imaging findings and, for RFA, relief from diagnostic blocks.
- The note documents duration of symptoms and conservative care tried
- For RFA: two diagnostic medial branch blocks with documented relief, as the payer requires
- Pain scores and functional change recorded for repeat procedures
2. Frequency limit exceeded (CO-119)
Payers cap the number of sessions per region per year.
- Count prior sessions for this region in the payer's look-back period
- Document response to the last procedure before repeating it
3. No prior authorization (CO-197)
- Authorization on file for the exact code, level and side performed
- If the procedure changed in the room, request an updated authorization where the payer allows
4. Imaging guidance billed separately (CO-97)
Epidural codes 62321/62323, transforaminal codes 64479–64484 and facet codes 64490–64495 include imaging guidance.
- 77003 not billed with codes that already include guidance (details)
5. Bilateral procedure errors (CO-4 or underpaid)
- Modifier 50 or RT/LT used the way this payer requires, not both
- Remittance checked against the contract's bilateral rate (details)
6. Distinct-procedure modifier not supported (CO-97 or CO-4)
- 59 or XS used only when the note shows a separate site or session
- The NCCI edit for the pair allows a modifier at all (59 vs XS)
7. Diagnosis doesn't support the procedure (CO-11)
- ICD-10-CM codes match the payer's covered indications for that procedure
- Laterality and level in the diagnosis match the procedure
8. Missing or invalid claim information (CO-16)
- Levels, units and modifiers complete
- NDC and units for any injected drug that requires them
- Referring provider and authorization number where required
9. Coverage or eligibility problems (CO-27, CO-31)
- Eligibility re-verified within a few days of the procedure, not only at scheduling
- Coordination of benefits confirmed when the patient has two plans
10. Filed too late (CO-29)
- Claims submitted within 48 hours of the procedure note being signed
- Rejections from the clearinghouse worked daily, so a rejected claim doesn't quietly age past the filing limit (timely filing limits)
Using the checklist
Run it on a sample of 20 recent claims. Wherever you find the same miss more than twice, fix the template, the charge entry rule or the authorization workflow that caused it. That is where most denial reduction comes from: fixing causes rather than appealing the same denial every month.
For the full picture of pain billing, see our pain management billing page.
Codes and policies change. Check current CPT descriptors, NCCI edits and each payer's policy.
This article is general billing information, not legal or coding-compliance advice. Payer rules, CPT descriptors and federal guidance change; check the current versions for your claims.