ICD-10 H21.549
Billable / SpecificPosterior synechiae (iris), unspecified eye
About ICD-10-CM H21.549
ICD-10-CM code H21.549 represents Posterior synechiae (iris), unspecified eye. This is a billable/specific code in the Eye and Adnexa chapter (block H21). The 2026 edition of ICD-10-CM H21.549 became effective on October 1, 2025.
Medicare LCD Coverage for H21.549
Local Coverage Determinations (LCDs) from CMS MACs that list H21.549 as a covered diagnosis.
Showing top 3. Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing H21.549.
1 Medicare
CPT Codes Commonly Billed with H21.549
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 H21.549 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 |
|---|---|---|
| H21.549 | 36471 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To H21.549
Other codes in section H15-H22 (Disorders of sclera, cornea, iris and ciliary body).
ICD-10 H21.549, Billing FAQ
Is ICD-10 code H21.549 billable? +
Yes, H21.549 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What ICD-9 codes does H21.549 map to? +
Per CMS GEMs, H21.549 maps to ICD-9 codes: 36471. 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 June 1, 2026.
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