2026 ICD-10-CM Diagnosis Code O90.6Postpartum mood disturbance

ICD-10-CM Codes›O00-O9A›O85-O92›O90

ICD-10-CM O90.6
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O90.6 is a billable ICD-10-CM diagnosis code for postpartum mood disturbance. 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 maternity blues. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complications specified during the puerperium and Depressive disorders.

Code Identity

ICD-10-CM Code
O90.6
Billable Status
Yes — Valid for Submission
Code Describes
Postpartum mood disturbance
Short Description
Postpartum mood disturbance
Same as the full description in the CMS dataset.
Parent Code
O90
Complications of the puerperium, not elsewhere classified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO85-O92Complications predominantly related to the puerperium
CategoryO90Complications of the puerperium, not elsewhere classified
This CodeO90.6Postpartum mood disturbance

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O90.6.

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.

  • Maternity blues
  • Postpartum depression
  • Postpartum mood disorder
  • Transitory postpartum mood disturbance

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Postpartum blues
  • Postpartum dysphoria
  • Postpartum sadness

Type 1 Excludes

  • postpartum depression F53.0
  • puerperal psychosis F53.1

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.

    • Blues, postpartal
    • Blues, postpartal
      • baby
    • Dysphoria
      • postpartal
    • Puerperal, puerperium(complicated by, complications)
      • mood disturbance
    • Sadness, postpartal

Clinical ClassificationClinical

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

CCSR PRG027
Complications specified during the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR MBD002
Depressive disorders
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Mental Disorders

Mental disorders (or mental illnesses) are conditions that affect your thinking, feeling, mood, and behavior. They may happen over a short period of time or come and go. Some can be chronic (long-lasting). They can affect your ability to relate to others and function each day..

The full article covers:

  • What are mental disorders?
  • What are some types of mental disorders?
  • What causes mental disorders?
  • Who is at risk for mental disorders?
  • How are mental disorders diagnosed?
  • What are the treatments for mental disorders?

Read the full article at MedlinePlus

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

Convert O90.6 to ICD-9-CMHistory

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

ICD-9-CM
648.42 Mental dis-deliv w p/p
Approximate The match is approximate rather than exact.
ICD-9-CM
648.44 Mental disorder-postpart
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 O90.6Overview

Is O90.6 (Complications of the puerperium, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postpartum mood disturbance on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can O90.6 be reported for?

The Medicare Code Editor checks postpartum mood disturbance 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 O90.6?

Under the General Equivalence Mappings, postpartum mood disturbance converts to ICD-9-CM 648.42 (mental dis-deliv w p/p) and 648.44 (mental disorder-postpart). 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.