O34.33 Maternal care for cervical incompetence, third trimester

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applies from O34 Maternal care for abnormality of pelvic organs

Includes

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

Code first

• any associated obstructed labor (O65.5)

Use additional code

• code for specific condition

Applies from O34.3 Maternal care for cervical incompetence

Applicable to

• Maternal care for cerclage with or without cervical incompetence
• Maternal care for Shirodkar suture with or without cervical incompetence

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 654.51 Cervical incompetence, delivered, with or without mention of antepartum condition (approximate)
• 654.52 Cervical incompetence, delivered, with mention of postpartum complication (approximate)
• 654.53 Cervical incompetence, antepartum condition or complication (approximate)
• 654.54 Cervical incompetence, postpartum 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 O34.33

Back-references to O34.3

• Type 1 Excludes: N88.3 Incompetence of cervix uteri ("cervical incompetence complicating pregnancy (O34.3-)")

Back-references to O34

• Use Additional: O65.5 Obstructed labor due to abnormality of maternal pelvic organs ("code to identify abnormality of pelvic organs O34.-")
• Type 2 Excludes: O99.8 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium ("maternal care for known or suspected abnormality of maternal pelvic organs (O34.-)")

Nearby codes

• O34.29 Maternal care due to uterine scar from other previous surgery
• O34.3 Maternal care for cervical incompetence
• O34.30 Maternal care for cervical incompetence, unspecified trimester
• O34.31 Maternal care for cervical incompetence, first trimester
• O34.32 Maternal care for cervical incompetence, second trimester
• O34.33 Maternal care for cervical incompetence, third trimester (this code)
• O34.4 Maternal care for other abnormalities of cervix
• O34.40 Maternal care for other abnormalities of cervix, unspecified trimester
• O34.41 Maternal care for other abnormalities of cervix, first trimester
• O34.42 Maternal care for other abnormalities of cervix, second trimester
• O34.43 Maternal care for other abnormalities of cervix, third trimester