ICD-10 O99.013
Billable / SpecificAnemia complicating pregnancy, third trimester
About ICD-10-CM O99.013
ICD-10-CM code O99.013 represents Anemia complicating pregnancy, third trimester. This is a billable/specific code in the Pregnancy, Childbirth, and Puerperium chapter (block O99). The 2026 edition of ICD-10-CM O99.013 became effective on October 1, 2025.
Coding Tips for O99.013
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
Most O codes require a 7th character indicating trimester (1 = first, 2 = second, 3 = third). Some require fetus identification character. Code O09 (supervision of high-risk pregnancy) is required as a secondary code when applicable.
Medicare LCD Coverage for O99.013
Local Coverage Determinations (LCDs) from CMS MACs that list O99.013 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 O99.013.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but O99.013 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with O99.013
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 O99.013 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 |
|---|---|---|
| O99.013 | 64821 | 10000 |
| O99.013 | 64823 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To O99.013
Other codes in section O94-O9A (Other obstetric conditions, not elsewhere classified).
ICD-10 O99.013, Billing FAQ
Is ICD-10 code O99.013 billable? +
Yes, O99.013 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What ICD-9 codes does O99.013 map to? +
Per CMS GEMs, O99.013 maps to ICD-9 codes: 64821, 64823. 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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