ICD-10 F79
Billable / SpecificUnspecified intellectual disabilities
About ICD-10-CM F79
ICD-10-CM code F79 represents Unspecified intellectual disabilities. This is a billable/specific code in the Mental, Behavioral, and Neurodevelopmental chapter (block F79). The 2026 edition of ICD-10-CM F79 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under F79. Per CMS ICD-10-CM Tabular 2026.
- Mental deficiency NOS
- Mental subnormality NOS
Medicare LCD Coverage for F79
Local Coverage Determinations (LCDs) from CMS MACs that list F79 as a covered diagnosis.
Showing top 10 of 93 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing F79.
1 Aetna
1 Cigna
3 Medicare
CPT Codes Commonly Billed with F79
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 92571 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92568 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92620 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92588 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92572 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92579 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92582 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92576 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92621 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
- 92570 CMS LCD: Billing and Coding: Vestibular and Audiologic Function Studies CMS LCD
Convert F79 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 |
|---|---|---|
| F79 | 319 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To F79
Other codes in section F70-F79 (Intellectual disabilities).
ICD-10 F79, Billing FAQ
Is ICD-10 code F79 billable? +
Yes, F79 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 F79? +
ICD-10 F79 includes: Mental deficiency NOS; Mental subnormality NOS.
What CPT codes are commonly billed with F79? +
Procedures frequently paired with F79 include: 92571, 92568, 92620, 92588, 92572.
What ICD-9 codes does F79 map to? +
Per CMS GEMs, F79 maps to ICD-9 codes: 319. Useful for legacy data review and historical claim analysis.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team