O33.9 Maternal care for disproportion, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Maternal care for disproportion due to cephalopelvic disproportion NOS
• Maternal care for disproportion due to fetopelvic disproportion NOS

Applies from O33 Maternal care for disproportion

Includes

• the listed conditions as a reason for observation, hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor

Excludes1 (never code together)

• disproportion with obstructed labor (O65-O66)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 653.91 Unspecified disproportion, delivered, with or without mention of antepartum condition (approximate)
• 653.93 Unspecified disproportion, antepartum condition or complication (approximate)

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.

Code annotations containing back-references to O33.9

Back-references to O33.9

• Code First: O75.82 Onset (spontaneous) of labor after 37 completed weeks of gestation but before 39 completed weeks gestation, with delivery by (planned) cesarean section ("cephalopelvic disproportion (normally formed fetus) (O33.9)")

Back-references to O33

• Type 1 Excludes: M95.5 Acquired deformity of pelvis ("maternal care for known or suspected disproportion (O33.-)")

Diagnosis Index entries for O33.9

• Delivery (childbirth) (labor) › cesarean (for) › cephalopelvic disproportion
• Delivery (childbirth) (labor) › cesarean (for) › disproportion NOS
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › disproportion (due to)

Nearby codes

• O33.7XX3 Maternal care for disproportion due to other fetal deformities, fetus 3
• O33.7XX4 Maternal care for disproportion due to other fetal deformities, fetus 4
• O33.7XX5 Maternal care for disproportion due to other fetal deformities, fetus 5
• O33.7XX9 Maternal care for disproportion due to other fetal deformities, other fetus
• O33.8 Maternal care for disproportion of other origin
• O33.9 Maternal care for disproportion, unspecified (this code)