CPT 33264: ICD-10 codes that support medical necessity
These ICD-10-CM diagnoses support medical necessity for CPT 33264 under Medicare coverage policies (LCDs, NCDs, and Billing & Coding articles). Billing CPT 33264 with a diagnosis that isn't covered typically denies as CARC 50 — not medically necessary.
National approximation. Coverage varies by MAC and state — confirm against the specific LCD/NCD and article that applies to your jurisdiction and date of service.
| ICD-10 | Description |
|---|---|
| G90.01 | Carotid sinus syncope |
| I25.2 | Old myocardial infarction |
| I25.5 | Ischemic cardiomyopathy |
| I42.0 | Dilated cardiomyopathy |
| I42.1 | Obstructive hypertrophic cardiomyopathy |
| I42.2 | Other hypertrophic cardiomyopathy |
| I42.6 | Alcoholic cardiomyopathy |
| I42.7 | Cardiomyopathy due to drug and external agent |
| I42.8 | Other cardiomyopathies |
| I44.0 | Atrioventricular block, first degree |
| I44.1 | Atrioventricular block, second degree |
| I44.2 | Atrioventricular block, complete |
| I44.30 | Unspecified atrioventricular block |
| I44.7 | Left bundle-branch block, unspecified |
| I45.10 | Unspecified right bundle-branch block |
| I45.19 | Other right bundle-branch block |
| I45.2 | Bifascicular block |
| I45.3 | Trifascicular block |
| I45.6 | Pre-excitation syndrome |
| I45.81 | Long QT syndrome |
| I45.89 | Other specified conduction disorders |
| I46.2 | Cardiac arrest due to underlying cardiac condition |
| I46.9 | Cardiac arrest, cause unspecified |
| I47.10 | Supraventricular tachycardia, unspecified |
| I47.11 | Inappropriate sinus tachycardia, so stated |
| I47.19 | Other supraventricular tachycardia |
| I47.20 | Ventricular tachycardia, unspecified |
| I47.21 | Torsades de pointes |
| I47.29 | Other ventricular tachycardia |
| I47.9 | Paroxysmal tachycardia, unspecified |
| I48.11 | Longstanding persistent atrial fibrillation |
| I48.19 | Other persistent atrial fibrillation |
| I48.3 | Typical atrial flutter |
| I48.4 | Atypical atrial flutter |
| I48.91 | Unspecified atrial fibrillation |
| I48.92 | Unspecified atrial flutter |
| I49.01 | Ventricular fibrillation |
| I49.02 | Ventricular flutter |
| I49.3 | Ventricular premature depolarization |
| I49.5 | Sick sinus syndrome |
| I49.9 | Cardiac arrhythmia, unspecified |
| I50.21 | Acute systolic (congestive) heart failure |
| I50.22 | Chronic systolic (congestive) heart failure |
| I50.23 | Acute on chronic systolic (congestive) heart failure |
| I50.41 | Acute combined systolic (congestive) and diastolic (congestive) heart failure |
| I50.42 | Chronic combined systolic (congestive) and diastolic (congestive) heart failure |
| I50.43 | Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure |
| I50.84 | End stage heart failure |
| I5A | Non-ischemic myocardial injury (non-traumatic) |
| Q24.6 | Congenital heart block |
| T82.110A | Breakdown (mechanical) of cardiac electrode, initial encounter |
| T82.111A | Breakdown (mechanical) of cardiac pulse generator (battery), initial encounter |
| T82.118A | Breakdown (mechanical) of other cardiac electronic device, initial encounter |
| T82.119A | Breakdown (mechanical) of unspecified cardiac electronic device, initial encounter |
| T82.120A | Displacement of cardiac electrode, initial encounter |
| T82.121A | Displacement of cardiac pulse generator (battery), initial encounter |
| T82.128A | Displacement of other cardiac electronic device, initial encounter |
| T82.129A | Displacement of unspecified cardiac electronic device, initial encounter |
| T82.190A | Other mechanical complication of cardiac electrode, initial encounter |
| T82.191A | Other mechanical complication of cardiac pulse generator (battery), initial encounter |
| T82.198A | Other mechanical complication of other cardiac electronic device, initial encounter |
| T82.199A | Other mechanical complication of unspecified cardiac device, initial encounter |
| T82.7XXA | Infection and inflammatory reaction due to other cardiac and vascular devices, implants and grafts, initial encounter |
| Z00.6 | Encounter for examination for normal comparison and control in clinical research program |
| Z45.02 | Encounter for adjustment and management of automatic implantable cardiac defibrillator |
| Z76.82 | Awaiting organ transplant status |
| Z86.74 | Personal history of sudden cardiac arrest |
Frequently asked questions
Which ICD-10 codes support medical necessity for CPT 33264?
Medicare coverage policies (LCDs/NCDs and Billing & Coding articles) list 67 ICD-10 diagnosis codes that support medical necessity for CPT 33264. The covered codes are listed on this page. Coverage varies by MAC/state — always confirm against the policy that applies to you.
What is a medical-necessity (LCD/NCD) crosswalk?
A claim whose procedure isn't supported by a covered diagnosis denies as "not medically necessary" (CARC 50). CMS coverage policies define which diagnoses justify a procedure; this page is the ICD-10 → CPT 33264 view of that relationship.
More free billing tools: all crosswalks · NCCI edits · Medicare fees · denial codes
Informational only, not coding, billing, or legal advice. Based on CMS Medicare Coverage Database data; verify the current LCD/NCD for your MAC before billing.
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