F98.21Rumination disorder of infancy and childhood

F98.21 is the ICD-10-CM diagnosis code for rumination disorder of infancy and childhood. It belongs to category F98 (other behavioral and emotional disorders with onset usually occurring in childhood and adolescence), block F90-F98 (behavioral and emotional disorders with onset usually occurring in childhood and adolescence) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

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.

In MS-DRG v44.0, it is part of the grouping logic for DRG 882 (Neuroses Except Depressive, relative weight 0.9952), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2025 (title revised).

Before ICD-10, this condition was coded in ICD-9-CM as 307.53 (rumination disorder).