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ICD-10-CM 2027 diagnosis code

O99.21Obesity complicating pregnancy, childbirth, and the puerperium

Not billable — use a more specific code

O99.21 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.Short description: Obesity comp pregnancy, childbirth, and the puerperium

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O99.21

O99.21 is the ICD-10-CM diagnosis code for obesity complicating pregnancy, childbirth, and the puerperium. It belongs to category O99 (other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium), block O94-O9A (other obstetric conditions, not elsewhere classified) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

Within O99.2 (endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium), O99.21 is specifically for obesity complicating pregnancy, childbirth, and the puerperium. Related codes cover other endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium (O99.28).

To report this condition, pick the subcode that matches the documentation: O99.210 (trimester), O99.211 (trimester), O99.212 (trimester), O99.213 (trimester), O99.214 (childbirth) and O99.215 (puerperium).

Use an additional code to identify the type of obesity (E66.-). Use an additional code to identify specific condition.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under O99.21

Coding notes

Use additional codeAdd a secondary code to fully describe the condition
  • code to identify the type of obesity (E66.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to O99.21.

› From O99.2 Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium
Excludes2
  • diabetes mellitus (O24.-)
  • malnutrition (O25.-)
  • postpartum thyroiditis (O90.5)
› 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
  • 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

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

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to O99.21.

Codes whose notes reference O99.21

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)
  • No changes since FY2016.

Common questions about O99.21

Is O99.21 billable?

No. O99.21 is a header code. Report one of its more specific subcodes instead.