2026 ICD-10-CM Diagnosis Code F98.21Rumination disorder of infancy and childhood

ICD-10-CM Codes›F01–F99›F90-F98›F98

ICD-10-CM F98.21
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F98.21 is a billable ICD-10-CM diagnosis code for rumination disorder of infancy and childhood. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as posseting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Feeding and eating disorders.

Code Identity

ICD-10-CM Code
F98.21
Billable Status
Yes — Valid for Submission
Code Describes
Rumination disorder of infancy and childhood
Short Description
Rumination disorder of infancy and childhood
Same as the full description in the CMS dataset.
Parent Code
F98.2
Other feeding disorders of infancy and childhood

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF90-F98Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
CategoryF98Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence
This CodeF98.21Rumination disorder of infancy and childhood

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Posseting
  • Regurgitates after swallowing
  • Regurgitation of gastric content
  • Rumination disorder
  • Rumination disorder of infancy
  • Swallowing pattern - finding

Tabular List NotesGuidance

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

Inclusion Terms

  • Rumination disorder in infancy or childhood, in remission

Type 1 Excludes

  • rumination disorder in adults F50.84

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.

    • Disorder(of)
      • eating (adult) (psychogenic)
        • child
          • rumination disorder (in remission)
    • Disorder(of)
      • eating (adult) (psychogenic)
        • rumination
          • infancy or childhood (in remission)
    • Disorder(of)
      • rumination (infant or child) (in remission)
    • Rumination
      • disorder of infancy or childhood (in remission)

Clinical ClassificationClinical

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

CCSR MBD010
Feeding and eating disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Infant and Newborn Nutrition

Food provides the energy and nutrients that babies need to be healthy. For a baby, breast milk is best. It has all the necessary vitamins and minerals. Infant formulas are available for babies whose mothers are not able to or decide not to breastfeed.

Read the full article at MedlinePlus

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

Convert F98.21 to ICD-9-CMHistory

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

ICD-9-CM
307.53 Rumination disorder
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 2017–2024No changes
FY 2025RevisedCode revised
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F98.21Overview

Is F98.21 (Other feeding disorders of infancy and childhood) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report rumination disorder of infancy and childhood on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of F98.21?

Under the General Equivalence Mappings, rumination disorder of infancy and childhood converts to ICD-9-CM 307.53 (rumination disorder). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.