ICD-10 Q66.89
Billable / SpecificOther specified congenital deformities of feet
About ICD-10-CM Q66.89
ICD-10-CM code Q66.89 represents Other specified congenital deformities of feet. This is a billable/specific code in the Congenital Malformations chapter (block Q66). The 2026 edition of ICD-10-CM Q66.89 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under Q66.89. Per CMS ICD-10-CM Tabular 2026.
- Congenital asymmetric talipes
- Congenital clubfoot NOS
- Congenital talipes NOS
- Congenital tarsal coalition
- Hammer toe, congenital
Medicare LCD Coverage for Q66.89
Local Coverage Determinations (LCDs) from CMS MACs that list Q66.89 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing Q66.89.
2 Cigna
1 Aetna
CPT Codes Commonly Billed with Q66.89
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 28292 Bunionectomy — hallux valgus bilateral, hammer toe, congenital foot deformity Podiatry
Convert Q66.89 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 |
|---|---|---|
| Q66.89 | 75470 | 10000 |
| Q66.89 | 75479 | 10000 |
| Q66.89 | 75566 | 10000 |
| Q66.89 | 75567 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To Q66.89
Other codes in section Q65-Q79 (Congenital malformations and deformations of the musculoskeletal system).
ICD-10 Q66.89, Billing FAQ
Is ICD-10 code Q66.89 billable? +
Yes, Q66.89 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 Q66.89? +
ICD-10 Q66.89 includes: Congenital asymmetric talipes; Congenital clubfoot NOS; Congenital talipes NOS, and 2 more clinical synonyms.
What CPT codes are commonly billed with Q66.89? +
Procedures frequently paired with Q66.89 include: 28292.
What ICD-9 codes does Q66.89 map to? +
Per CMS GEMs, Q66.89 maps to ICD-9 codes: 75470, 75479, 75566, 75567. 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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