2026 ICD-10-CM Diagnosis Code O99.12Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth

ICD-10-CM Codes›O00-O9A›O94-O9A›O99

ICD-10-CM O99.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O99.12 is a billable ICD-10-CM diagnosis code for other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as blood coagulation disorder complicating childbirth. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complications specified during childbirth.

Code Identity

ICD-10-CM Code
O99.12
Billable Status
Yes — Valid for Submission
Code Describes
Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth
Short Description
Oth dis of the bld/bld-form org/immun mechnsm comp chldbrth
Parent Code
O99.1
Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium

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 CodeO99.12Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O99.12.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Blood coagulation disorder complicating childbirth
  • Maternal perinatal purpura

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Delivery(childbirth) (labor)
      • complicated
        • by
          • blood disorder NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG023
Complications specified during childbirth
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Blood Disorders

Your blood is living tissue made up of liquid and solids. The liquid part, called plasma, is made of water, salts and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells and platelets.

Read the full article at MedlinePlus

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

Convert O99.12 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
649.31 Coagulation def-deliv
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O99.12Overview

Is O99.12 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can O99.12 be reported for?

The Medicare Code Editor checks other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O99.12?

Under the General Equivalence Mappings, other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth converts to ICD-9-CM 649.31 (coagulation def-deliv). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.