ICD-10-CM 2027
ICD-10 code for rumination disorder
From the official ICD-10-CM alphabetic index entry “Disorder (of) › rumination (infant or child) (in remission)”. Page updated September 29, 2026.
About coding rumination disorder
The ICD-10-CM code for rumination disorder is F98.21 (Rumination disorder of infancy and childhood). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on F98.21.
Within F98.2 (other feeding disorders of infancy and childhood), F98.21 is specifically for rumination disorder of infancy and childhood. Related codes cover other feeding disorders of infancy and early childhood (F98.29).
Don't report F98.21 together with the conditions in its Excludes1 note: rumination disorder in adults (F50.84).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific rumination disorder codes (official index)
- adult (in remission) F50.84 — Rumination disorder in adults
Don't confuse with (Excludes1 for F98.21)
- rumination disorder in adults (F50.84)
Common questions about rumination disorder ICD-10 codes
What is the ICD-10 code for rumination disorder?
- F98.21 — Rumination disorder of infancy and childhood. More specific codes apply when the documentation supports them: F50.84.
What is the ICD-10 code for adult rumination disorder?
- F50.84 — Rumination disorder in adults.
Is F98.21 billable?
- Yes. F98.21 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F98.21 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F98.21 as a principal diagnosis.
Is F98.21 a CC or MCC?
- No. F98.21 is neither a CC nor an MCC under MS-DRG v44.0.