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ICD-10-CM 2027 diagnosis code

O34.21Maternal care for scar from previous cesarean delivery

Not billable — use a more specific code

O34.21 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O34.21

O34.21 is the ICD-10-CM diagnosis code for maternal care for scar from previous cesarean delivery. It belongs to category O34 (maternal care for abnormality of pelvic organs), block O30-O48 (maternal care related to the fetus and amniotic cavity and possible delivery problems) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within O34.2 (maternal care due to uterine scar from previous surgery), O34.21 is specifically for maternal care for scar from previous cesarean delivery. Related codes cover for cesarean scar defect (isthmocele) (O34.22) and due to uterine scar from other previous surgery (O34.29).

To report this condition, pick the subcode that matches the documentation: O34.211 (delivery), O34.212 (delivery), O34.218 (delivery) and O34.219 (delivery).

Code first: any associated obstructed labor (O65.5).

Use an additional code for specific condition.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2017 (expanded into subcodes).

Specific codes under O34.21

Notes that apply from higher levels

Instructions written at a parent level also apply to O34.21.

› 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

Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.

Codes whose notes reference O34.21

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2017 (effective 10/1/2016): Expanded — no longer billable

Common questions about O34.21

Is O34.21 billable?

No. O34.21 is a header code. Report one of its more specific subcodes instead.