ICD-10 B99.9
Billable / SpecificUnspecified infectious disease
About ICD-10-CM B99.9
ICD-10-CM code B99.9 represents Unspecified infectious disease. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block B99). The 2026 edition of ICD-10-CM B99.9 became effective on October 1, 2025.
Medicare LCD Coverage for B99.9
Local Coverage Determinations (LCDs) from CMS MACs that list B99.9 as a covered diagnosis.
Showing top 10 of 537 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing B99.9.
4 Medicare
5 Aetna
CPT Codes Commonly Billed with B99.9
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 B99.9 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 |
|---|---|---|
| B99.9 | 1369 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To B99.9
Other codes in section B99 (Other infectious diseases).
ICD-10 B99.9, Billing FAQ
Is ICD-10 code B99.9 billable? +
Yes, B99.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What ICD-9 codes does B99.9 map to? +
Per CMS GEMs, B99.9 maps to ICD-9 codes: 1369. 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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