All ICD10 Codes
O99Not billable, use a more specific code below

Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

In Other obstetric conditions, not elsewhere classified (O94-O9A), chapter 15: Pregnancy, Childbirth and the Puerperium

96 billable codes under O99: 1 is an MCC, 20 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

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Instructional notes

Includes: conditions that are coded here

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

Excludes2: not included here, code separately if applicable

  • when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)

Use additional code: add a second code for this, listed after this one

  • code to identify specific condition

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Coding of obstetric cases with O00-O9A codes: sequencing priority, trimester and fetus characters, principal diagnosis selection, delivery outcome, and pregnancy-related complications.

Read Section I.C.15 (page 63), 11 more topics

All codes under O99

O99 can't be used on a claim. Pick a billable code below; grey headings group them.

O99 MS-DRGs

As the principal diagnosis, the billable codes under O99 group to these 8 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to O99

Notes on these codes point to O99.

  • O20-O29 Excludes2: maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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 more about childbirth problems on MedlinePlus

Health Problems in Pregnancy

A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.

Read more about health problems in pregnancy on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.