2026 ICD-10-CM Diagnosis Code O25.10Malnutrition in pregnancy, unspecified trimester

ICD-10-CM Codes›O00-O9A›O20-O29›O25

ICD-10-CM O25.10
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O25.10 is a billable ICD-10-CM diagnosis code for malnutrition in pregnancy, 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). Coders also document this condition as malnutrition. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Malnutrition and 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
O25.10
Billable Status
Yes — Valid for Submission
Code Describes
Malnutrition in pregnancy, unspecified trimester
Short Description
Malnutrition in pregnancy, unspecified trimester
Same as the full description in the CMS dataset.
Parent Code
O25.1
Malnutrition in pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO20-O29Other maternal disorders predominantly related to pregnancy
CategoryO25Malnutrition in pregnancy, childbirth and the puerperium
This CodeO25.10Malnutrition in pregnancy, unspecified trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O25.10.

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.

  • Malnutrition
  • Malnutrition in pregnancy

Clinical ClassificationClinical

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

CCSR END008
Malnutrition
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG028
Other specified complications in pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Child Nutrition Disorders

    disorders caused by nutritional imbalance, either overnutrition or undernutrition, occurring in children ages 2 to 12 years.

  • Fetal Nutrition Disorders

    disorders caused by nutritional imbalance, either overnutrition or undernutrition, in the fetus in utero.

  • Infant Nutrition Disorders

    disorders caused by nutritional imbalance, either overnutrition or undernutrition, occurring in infants ages 1 month to 24 months.

  • Malnutrition

    an imbalanced nutritional status resulting from insufficient intake of nutrients to meet normal physiological requirement.

  • Protein-Energy Malnutrition

    the lack of sufficient energy or protein to meet the body's metabolic demands, as a result of either an inadequate dietary intake of protein, intake of poor quality dietary protein, increased demands due to disease, or increased nutrient losses.

  • Severe Acute Malnutrition

    acute form of malnutrition which usually affects children, characterized by a very low weight for height (below -3z scores of the median world health organization standards), visible severe wasting, or occurrence of nutritional edema. it can be a direct or indirect cause of fatality in children suffering from diarrhea and pneumonia. do not confuse with starvation, a condition in which the body is not getting enough food, usually for extended periods of time.

  • Fetus

    the unborn young of a viviparous mammal, in the postembryonic period, after the major structures have been outlined. in humans, the unborn young from the end of the eighth week after conception until birth, as distinguished from the earlier embryo, mammalian.

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 O25.10 to ICD-9-CMHistory

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

ICD-9-CM
648.90 Oth curr cond preg-unsp
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 O25.10Overview

Is O25.10 (Malnutrition in pregnancy) a billable code?

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

What MS-DRG does O25.10 group to?

When malnutrition in pregnancy, 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 O25.10 be reported for?

The Medicare Code Editor checks malnutrition in pregnancy, 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 O25.10?

Under the General Equivalence Mappings, malnutrition in pregnancy, unspecified trimester converts to ICD-9-CM 648.90 (oth curr cond preg-unsp). 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.