O66.9

Clinical notes

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

• •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
• •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

ICD-9-CM equivalent

Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.

• 66091Approximate match
• 66090Approximate match
• 66093Approximate match

Associated MS-DRGs

O66.9 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.

Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.

• DRG 760Menstrual and Other Female Reproductive System Disorders with CC/MCC
• DRG 761Menstrual and Other Female Reproductive System Disorders without CC/MCC
• DRG 817Other Antepartum Diagnoses with O.R. Procedures with MCC
• DRG 818Other Antepartum Diagnoses with O.R. Procedures with CC
• DRG 819Other Antepartum Diagnoses with O.R. Procedures without CC/MCC
• DRG 831Other Antepartum Diagnoses without O.R. Procedures with MCC
• DRG 832Other Antepartum Diagnoses without O.R. Procedures with CC
• DRG 833Other Antepartum Diagnoses without O.R. Procedures without CC/MCC