ICD-10 O34.591
Billable / SpecificMaternal care for other abnormalities of gravid uterus, first trimester
About ICD-10-CM O34.591
ICD-10-CM code O34.591 represents Maternal care for other abnormalities of gravid uterus, first trimester. This is a billable/specific code in the Pregnancy, Childbirth, and Puerperium chapter (block O34). The 2026 edition of ICD-10-CM O34.591 became effective on October 1, 2025.
Coding Tips for O34.591
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 O34.591
Local Coverage Determinations (LCDs) from CMS MACs that list O34.591 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 O34.591.
1 Cigna
CPT Codes Commonly Billed with O34.591
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 O34.591 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 |
|---|---|---|
| O34.591 | 65441 | 10000 |
| O34.591 | 65442 | 10000 |
| O34.591 | 65443 | 10000 |
| O34.591 | 65444 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To O34.591
Other codes in section O30-O48 (Maternal care related to the fetus and amniotic cavity and possible delivery problems).
ICD-10 O34.591, Billing FAQ
Is ICD-10 code O34.591 billable? +
Yes, O34.591 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What ICD-9 codes does O34.591 map to? +
Per CMS GEMs, O34.591 maps to ICD-9 codes: 65441, 65442, 65443, 65444. 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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