2027 ICD-10-CM Diagnosis Code O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

ICD-10-CM Codes›O00-O9A›O94-O9A›O99

ICD-10-CM O99
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O99 is a non-billable ICD-10-CM category code for other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O99.011, O99.012, O99.013, and O99.019.

Code Identity

ICD-10-CM Code
O99
Billable Status
No — Non-Billable Category
Code Describes
Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
Short Description
Oth maternal diseases classd elsw but compl preg/chldbrth
Chapter
O94-O9A
Other obstetric conditions, not elsewhere classified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO94-O9AOther obstetric conditions, not elsewhere classified
CategoryO99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
This CodeO99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Specific Coding for Oth maternal diseases classd elsw but compl preg/chldbrthOverview

Non-specific codes like O99 require more characters. Use one of these billable codes instead:

  • O99.0 for Anemia complicating pregnancy, childbirth and the puerperium

  • O99.01 for Anemia complicating pregnancy

  • Use O99.02 for Anemia complicating childbirth

  • Use O99.03 for Anemia complicating the puerperium

  • O99.1 for Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium

  • O99.11 for Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy

  • Use O99.12 for Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth

  • Use O99.13 for Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating the puerperium

  • O99.2 for Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium

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

  • O99.28 for Other endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium

  • O99.3 for Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium

  • O99.31 for Alcohol use complicating pregnancy, childbirth, and the puerperium

  • O99.32 for Drug use complicating pregnancy, childbirth, and the puerperium

  • O99.33 for Tobacco use disorder complicating pregnancy, childbirth, and the puerperium

  • O99.34 for Other mental disorders complicating pregnancy, childbirth, and the puerperium

  • O99.35 for Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium

  • O99.4 for Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium

  • O99.41 for Diseases of the circulatory system complicating pregnancy

  • Use O99.42 for Diseases of the circulatory system complicating childbirth

  • Use O99.43 for Diseases of the circulatory system complicating the puerperium

  • O99.5 for Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium

  • O99.51 for Diseases of the respiratory system complicating pregnancy

  • Use O99.52 for Diseases of the respiratory system complicating childbirth

  • Use O99.53 for Diseases of the respiratory system complicating the puerperium

  • O99.6 for Diseases of the digestive system complicating pregnancy, childbirth and the puerperium

  • O99.61 for Diseases of the digestive system complicating pregnancy

  • Use O99.62 for Diseases of the digestive system complicating childbirth

  • Use O99.63 for Diseases of the digestive system complicating the puerperium

  • O99.7 for Diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium

  • O99.71 for Diseases of the skin and subcutaneous tissue complicating pregnancy

  • Use O99.72 for Diseases of the skin and subcutaneous tissue complicating childbirth

  • Use O99.73 for Diseases of the skin and subcutaneous tissue complicating the puerperium

  • O99.8 for Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium

  • O99.81 for Abnormal glucose complicating pregnancy, childbirth and the puerperium

  • O99.82 for Streptococcus B carrier state complicating pregnancy, childbirth and the puerperium

  • O99.83 for Other infection carrier state complicating pregnancy, childbirth and the puerperium

  • O99.84 for Bariatric surgery status complicating pregnancy, childbirth and the puerperium

  • O99.89 for Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O99: its own notes plus those printed at Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On O99 itself
  • when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

On O99 itself
  • code to identify specific condition
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Childbirth Problems

Childbirth is the process of giving birth to a baby. It includes labor and delivery. Usually everything goes well, but problems can happen. They may cause a risk to the mother, baby, or both. Some of the more common childbirth problems include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O99Overview

Is O99 a billable code?

No. This is a category header that groups the codes for other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium, and headers cannot be submitted on claims. Claims for other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium need a more specific code from this category, such as O99.011, O99.012, and O99.013.

Does O99 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: code to identify specific condition. The additional code is reported after O99.