ICD-10 I49.9
Billable / SpecificCardiac arrhythmia, unspecified
About ICD-10-CM I49.9
ICD-10-CM code I49.9 represents Cardiac arrhythmia, unspecified. This is a billable/specific code in the Circulatory System chapter (block I49). The 2026 edition of ICD-10-CM I49.9 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under I49.9. Per CMS ICD-10-CM Tabular 2026.
- Arrhythmia (cardiac) NOS
Medicare LCD Coverage for I49.9
Local Coverage Determinations (LCDs) from CMS MACs that list I49.9 as a covered diagnosis.
Showing top 10 of 210 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I49.9.
5 Aetna
1 Cigna
5 Medicare
CPT Codes Commonly Billed with I49.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 93000 EKG 12-lead — tachycardia, bradycardia, palpitations, HTN, CAD, AFib, arrhythmia, chest pain, syncope, cardiomyopathy, AV block, bundle branch block, SVT, VT, diabetes screening, abnormal EKG Cardiology
- 93010 EKG interpretation only — same dx as 93000 Cardiology
- G0448 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33216 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33230 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33244 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33264 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33263 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33220 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33224 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
Convert I49.9 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| I49.9 | 4279 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I49.9
Other codes in section I30-I5A (Other forms of heart disease).
ICD-10 I49.9, Billing FAQ
Is ICD-10 code I49.9 billable? +
Yes, I49.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to I49.9? +
ICD-10 I49.9 includes: Arrhythmia (cardiac) NOS.
What CPT codes are commonly billed with I49.9? +
Procedures frequently paired with I49.9 include: 93000, 93010, G0448, 33216, 33230.
What ICD-9 codes does I49.9 map to? +
Per CMS GEMs, I49.9 maps to ICD-9 codes: 4279. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on August 30, 2026.
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