ICD-10 H66.12
Billable / SpecificChronic tubotympanic suppurative otitis media, left ear
About ICD-10-CM H66.12
ICD-10-CM code H66.12 represents Chronic tubotympanic suppurative otitis media, left ear. This is a billable/specific code in the Ear and Mastoid Process chapter (block H66). The 2026 edition of ICD-10-CM H66.12 became effective on October 1, 2025.
Medicare LCD Coverage for H66.12
Local Coverage Determinations (LCDs) from CMS MACs that list H66.12 as a covered diagnosis.
Showing top 10 of 65 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing H66.12.
2 Medicare
CPT Codes Commonly Billed with H66.12
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert H66.12 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 |
|---|---|---|
| H66.12 | 3821 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To H66.12
Other codes in section H65-H75 (Diseases of middle ear and mastoid).
ICD-10 H66.12, Billing FAQ
Is ICD-10 code H66.12 billable? +
Yes, H66.12 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What ICD-9 codes does H66.12 map to? +
Per CMS GEMs, H66.12 maps to ICD-9 codes: 3821. 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 May 31, 2026.
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