F84.9
Pervasive developmental disorder, unspecified
F84.9 (also written F849) is a billable ICD-10-CM diagnosis code for pervasive developmental disorder, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 6 codes in category F84 (Pervasive developmental disorders). The Alphabetic Index lists it under 5 entries. Its coding notes include a Code also instruction and 1 Excludes2 entry.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
- any associated medical condition and intellectual disabilities
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 294 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CIPF Primary
IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:
| MS-DRG | Description | Factor |
|---|---|---|
| 885 | Psychoses | 1.00 |
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- disorders of psychological development
Inclusion terms
Conditions classified to this code.
- Atypical autism
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 5 entries