2026 ICD-10-CM Diagnosis Code O26.899Other specified pregnancy related conditions, unspecified trimester

ICD-10-CM Codes›O00-O9A›O20-O29›O26

ICD-10-CM O26.899
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O26.899 is a billable ICD-10-CM diagnosis code for other specified pregnancy related conditions, unspecified trimester. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified complications in pregnancy.

This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such maternal disorders related to pregnancy.

Code Identity

ICD-10-CM Code
O26.899
Billable Status
Yes — Valid for Submission
Code Describes
Other specified pregnancy related conditions, unspecified trimester
Short Description
Oth pregnancy related conditions, unspecified trimester
Parent Code
O26.89
Other specified pregnancy related conditions

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO20-O29Other maternal disorders predominantly related to pregnancy
CategoryO26Maternal care for other conditions predominantly related to pregnancy
This CodeO26.899Other specified pregnancy related conditions, unspecified trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O26.899.

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.

  • Acquired factor VIII deficiency disease
  • Alopecia of pregnancy
  • Back pain complicating pregnancy
  • Chaussier's sign
  • Desire for urination
  • Dyspepsia during pregnancy
  • Endocrine alopecia
  • Finding of desire for urination
  • Finding of frequency of urination
  • Finding of general observation of digestion
  • Finding of measures of fetus
  • Generalized enlargement of gingiva exacerbated by pregnancy
  • Gestational age unknown
  • Gingival disease due to pregnancy
  • Increased frequency of urination
  • Indigestion
  • Joint pain of pelvic region
  • Low back pain in pregnancy
  • Melasma gravidarum
  • Pain in round ligament in pregnancy
  • Pain in symphysis pubis in pregnancy
  • Pain of joint of pelvis and/or upper leg
  • Pelvic girdle pain
  • Pelvic girdle pain during pregnancy
  • Pregnancy-related exacerbation of dermatosis
  • Pregnancy-related factor VIII deficiency
  • Pruritus of pregnancy
  • Sacral back pain
  • Spider nevus
  • Spider telangiectasis in association with pregnancy
  • Spider telangiectasis, secondary
  • Urgent desire to urinate
  • Urinary frequency during pregnancy
  • Urinary urgency during pregnancy

Clinical ClassificationClinical

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

CCSR PRG028
Other specified complications in pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Pelvic Girdle Pain

    discomfort associated with the bones that make up the pelvic girdle. it occurs frequently during pregnancy.

  • GAIA Level 1 Vasa Previa|Global Alignment of Immunization safety Assessment in pregnancy Level 1 Vasa Previa|Level 1 Vasa Previa

    gaia level 1 vasa previa is defined by two criteria: first, second trimester ultrasound evidence of fetal vessels (vessel with fetal heart rate identified by color flow doppler) traversing the membranes and overlying the internal cervical os; second, post-delivery examination of the placental specimen that demonstrates unsupported fetal vessels within the membranes.

  • GAIA Level 2 Vasa Previa|Global Alignment of Immunization safety Assessment in pregnancy Level 2 Vasa Previa|Level 2 Vasa Previa

    gaia level 2 vasa previa is defined by four criteria: first, vaginal bleeding during the second or third trimester at the time of ruptured amniotic membranes; second, fetal heart rate changes ultimately resulting in sinusoidal rhythm/terminal bradycardia; third, delivery of one of the following: a) a pale, anemic infant; or b) a recent stillbirth; or c) a neonatal death; fourth, post-delivery examination of the placental specimen that demonstrates unsupported fetal vessels within the membranes.

  • Vasa Previa

    umbilical blood vessels that have inserted into the amniotic membrane (membranous insertion) that in turn are above or adjacent to the cervical os and are at risk of rupture.

Patient EducationClinical

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.

The full article covers:

  • What are health problems in pregnancy?
  • What raises my risk for health problems during pregnancy?
  • Can chronic health conditions cause problems in pregnancy?
  • Can health problems in pregnancy be prevented?

Read the full article at MedlinePlus

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

Convert O26.899 to ICD-9-CMHistory

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

ICD-9-CM
646.80 Preg compl NEC-unspec
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 O26.899Overview

Is O26.899 (Other specified pregnancy related conditions) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified pregnancy related conditions, unspecified trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O26.899 group to?

When other specified pregnancy related conditions, unspecified trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O26.899 be reported for?

The Medicare Code Editor checks other specified pregnancy related conditions, unspecified trimester 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 O26.899?

Under the General Equivalence Mappings, other specified pregnancy related conditions, unspecified trimester converts to ICD-9-CM 646.80 (preg compl NEC-unspec). 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.