ICD-10-CM 2027 diagnosis code

O99.0Anemia complicating pregnancy, childbirth and the puerperium

Not billable — use a more specific code

O99.0 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

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 O99.0

O99.0 is the ICD-10-CM diagnosis code for anemia 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 3 subcodes must be used instead.

Within O99 (other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium), O99.0 is specifically for anemia complicating pregnancy, childbirth and the puerperium. Related codes cover other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium (O99.1), endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium (O99.2), mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium (O99.3), diseases of the circulatory system complicating pregnancy, childbirth and the puerperium (O99.4), diseases of the respiratory system complicating pregnancy, childbirth and the puerperium (O99.5), diseases of the digestive system complicating pregnancy, childbirth and the puerperium (O99.6), diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium (O99.7) and other specified diseases and conditions complicating pregnancy, childbirth and the puerperium (O99.8).

To report this condition, pick the subcode that matches the documentation: O99.01 (pregnancy), O99.02 (childbirth) and O99.03 (puerperium).

Don't report O99.0 together with the conditions in its Excludes1 note: anemia arising in the puerperium (O90.81) and postpartum anemia NOS (O90.81).

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 O99.0

Coding notes

Applicable toConditions and synonyms classified to this code

Conditions in D50-D64

Excludes1Not coded here — never report together with this code

anemia arising in the puerperium (O90.81)
postpartum anemia NOS (O90.81)

Notes that apply from higher levels

Instructions written at a parent level also apply to O99.0.

› 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.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about O99.0

Is O99.0 billable?: No. O99.0 is a header code. Report one of its more specific subcodes instead.