O99.891 Other specified diseases and conditions complicating pregnancy

Billable ICD-10-CM code, FY2026.

Applies from O99 Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Includes

• conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care

Excludes2 (not included here)

• when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)

Use additional code

• code to identify specific condition

Applies from O99.8 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium

Applicable to

• Conditions in D00-D48, H00-H95, M00-N99, and Q00-Q99

Excludes2 (not included here)

• genitourinary infections in pregnancy (O23.-)
• infection of genitourinary tract following delivery (O86.1-O86.4)
• malignant neoplasm complicating pregnancy, childbirth and the puerperium (O9A.1-)
• maternal care for known or suspected abnormality of maternal pelvic organs (O34.-)
• postpartum acute kidney failure (O90.49)
• traumatic injuries in pregnancy (O9A.2-)

Use additional code

• code to identify condition

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Diagnosis Index entries for O99.891

• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › connective system disorders (conditions in M00-M99)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › diseases of › specified NEC
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › disorders of › ear and mastoid process (conditions in H60-H95)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › disorders of › eye and adnexa (conditions in H00-H59)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › disorders of › specified NEC
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › musculoskeletal condition (conditions is M00-M99)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › pelvic inflammatory disease
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › peritoneal (pelvic) adhesions

Nearby codes

• O99.842 Bariatric surgery status complicating pregnancy, second trimester
• O99.843 Bariatric surgery status complicating pregnancy, third trimester
• O99.844 Bariatric surgery status complicating childbirth
• O99.845 Bariatric surgery status complicating the puerperium
• O99.89 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium
• O99.891 Other specified diseases and conditions complicating pregnancy (this code)
• O99.892 Other specified diseases and conditions complicating childbirth
• O99.893 Other specified diseases and conditions complicating puerperium