ICD-10 codes for coronary artery disease
Atherosclerotic heart disease of native coronary artery without angina is often I25.10. PCI, stress testing, or cardiac rehab denials need angina class, stress test results, and guideline citations—not the ICD code alone.
Code search and filter
Filter the reference table by code or keyword (FY2025+ CM where noted).
| Code | Description | When used | Billable / notes |
|---|---|---|---|
| I25.10 | Atherosclerotic heart disease of native coronary artery without angina pectoris | Known CAD without current angina documentation. | Billable FY2025+ when supported. |
| I25.119 | Atherosclerotic heart disease with angina pectoris, unspecified | CAD with angina when specificity unavailable. | Billable; specify angina type when documented. |
| I25.110 | Atherosclerotic heart disease with unstable angina | Unstable angina documented in note. | Billable; supports urgent testing appeals. |
| Z95.1 | Presence of aortocoronary bypass graft | History of CABG on problem list. | Billable secondary/status code when documented. |
Check my denial
Pick the closest denial type to see how to respond on this code page.
Medical necessity (CO-50)
Attach treating clinician note linking diagnosis to denied service and cite plan policy sections.
Also try denial code lookup for exact CARC/RARC text from your EOB.
Common CPT pairings on claims
Documentation checklist
- Signed clinical note for date of service
- Primary diagnosis matching claim ICD-10
- Medical necessity rationale for denied service
- Prior treatments and response
- Plan authorization numbers if applicable
Top denial reasons and how to beat each one
Medical necessity (CO-50)
Attach treating clinician note linking diagnosis to denied service and cite plan policy sections.
Prior authorization missing
Provide auth number, retro-auth request, or emergency exception documentation.
Frequency / visit limits
Show ongoing functional improvement and recertified plan of care.
Sample appeal paragraph
I am appealing the denial of [service] related to Coronary artery disease (CAD) (ICD-10 I25.10). My treating clinician documented [clinical findings] on [date]. The service is necessary to [goal]. Please review the attached records and reverse the denial.
Step therapy and PT visit limits
Many plans require step therapy or visit limits for therapy and specialty drugs tied to Coronary artery disease (CAD). Read your certificate of coverage for exact visit caps and fail-first rules.
Medicare LCD / coverage notes
Stress testing and catheterization have NCD/LCD indications tied to symptoms and risk — cite active CMS policies for your MAC.
Related codes
- I25.119 — Alternate documented code
Using diagnosis codes in appeals
Coronary artery disease (CAD) claims typically include I25.10 or I25.119 when documentation supports the diagnosis. A denial may argue the diagnosis does not support the billed procedure, that care is not restorative, or that a more specific code was required. Align the appeal letter with the signed office note — mismatches between claim and chart trigger automated edits.
Clinical summary for reviewers
Document vessel involvement, prior MI, and current symptoms when submitting authorizations.
Medical necessity angle
Link denied procedures to ischemia documentation and failed medical management. Link symptoms, exam findings, and prior conservative care when imaging or surgery is denied. Cite plan medical policy sections when you have them; request a copy if the denial referenced internal criteria you have not seen.
Related AppealFlow resources
Use the letter of medical necessity builder for physician-signed support, the ICD-10 hub for related conditions, and CPT code pages for procedure pairing. When ready to file, export a PDF from /generate and attach the treating clinician's note.
Diagnosis codes on claims vs in chart notes
ICD-10 codes describe conditions; they do not by themselves prove that a specific procedure is appropriate. Payers match diagnosis to procedure using policy edits. When a denial says the diagnosis does not support the service, fix documentation with your clinician before re-filing.
Pairing codes with medical necessity appeals
Use the medical necessity appeal generator and letter-of-medical-necessity tool together: member letter plus signed clinician statement. Attach office notes that mention duration, exam findings, and failed conservative care when imaging or therapy is denied.
External resources
Look up related CPT codes on /cpt-codes, denial codes on /tools/denial-code-lookup, and deadlines on /tools/appeal-deadline-calculator. None of these tools guarantee coverage outcomes.
Maintenance vs restorative care
Payers sometimes deny therapy or imaging as maintenance when notes do not show functional improvement goals. Appeals should document measurable functional deficits and expected restoration, not only chronic pain duration.
FAQs
AppealFlow editorial · https://appealflow.net/icd-10/coronary-artery-disease