2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 882. Coders also document this condition as posseting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Feeding and eating disorders.

F98.21 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 for payment year 2027.

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

Medicare Risk Adjustment (HCC)Billing

F98.21 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 133 — Anxiety and Other Psychiatric Disorders
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F98.21: its own notes plus those printed at F98.2, F98, block F90-F98, and Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Rumination disorder in infancy or childhood, in remission

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • rumination disorder in adults (F50.84)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From F98.2 Other feeding disorders of infancy and childhood applies to 2 codes
  • anorexia nervosa and other eating disorders (F50.-)
  • feeding difficulties (R63.3-)
  • feeding problems of newborn (P92.-)
  • pica of infancy or childhood (F98.3)
From F98 Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence applies to 9 codes
  • breath-holding spells (R06.89)
  • gender identity disorder of childhood (F64.2)
  • Kleine-Levin syndrome (G47.13)
  • obsessive-compulsive disorder (F42.-)
  • sleep disorders not due to a substance or known physiological condition (F51.-)
From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Notes

General instructions on how these codes are used.

From Block F90-F98 Behavioral and emotional disorders with onset usually occurring in childhood and adolescence applies to 33 codes
  • Codes within categories F90-F98 may be used regardless of the age of a patient. These disorders generally have onset within the childhood or adolescent years, but may continue throughout life or not be diagnosed until adulthood

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F98.21, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming F98.21: they are not reported together with it, unless the two conditions are unrelated.

  • F50.84 Rumination disorder in adults
    rumination disorder in infancy and childhood (F98.21)
  • Z72.4 Inappropriate diet and eating habits
    behavioral eating disorders of infancy or childhood (F98.2.-F98.3) names F98.2, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming F98.21: its condition is not part of those codes, and both may be reported when the patient has both.

  • F50 Eating disorders
    feeding disorder in infancy or childhood (F98.2-) names F98.2-, which includes this code
  • R63.3 Feeding difficulties
    infant feeding disorder of nonorganic origin (F98.2-) names F98.2-, which includes this code

Notes 1

These notes mention F98.21.

  • Block F90-F98 Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
    Codes within categories F90-F98 may be used regardless of the age of a patient. These disorders generally have onset within the childhood or adolescent years, but may continue throughout life or not be diagnosed until adulthood names F90-F98, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About F98.21Overview

What is the ICD-10 code for rumination disorder of infancy and childhood?

The ICD-10-CM code for rumination disorder of infancy and childhood is F98.21 (sometimes written as F9821). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does F98.21 group to?

When rumination disorder of infancy and childhood is the principal diagnosis on an inpatient stay, it groups to MS-DRG 882 (neuroses Except Depressive), which carries a relative weight of 0.9953. Higher weights mean higher Medicare reimbursement.

Can F98.21 be reported with F50.84?

Not as a rule. The Excludes1 note on F98.21 lists "rumination disorder in adults (F50.84)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

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.

Does F98.21 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: F98.21 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 (Anxiety and Other Psychiatric Disorders).