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ICD-10-CM F03.A3: Unspecified dementia, mild, with mood disturbance

F03.A3 is the billable ICD-10-CM code for unspecified dementia, mild, with mood disturbance, in category F03 (Unspecified dementia) of the Mental disorders due to known physiological conditions section. As a principal diagnosis it groups to MS-DRG 884 Organic Disturbances and Intellectual Disability (MDC 19 MDC 19: Mental Diseases and Disorders). It maps to HCC 127 (Dementia, Mild or Unspecified) in CMS-HCC V28. As a secondary diagnosis it is a CC, excluded with 20 principal diagnoses. 13 LCD billing and coding articles list it as covered.

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
F03.A3
billable FY2027 ICD-10-CM code
Category
F03 Unspecified dementia
Chapter
5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
CC/MCC (MS-DRG v44)
CC
CMS-HCC V28
HCC 127
POA reporting
Required

Tabular list notes for F03.A3

The tabular list has no notes on F03.A3 itself; the notes below apply from its parent headings.

Inherited from F03 (Unspecified dementia)

Inclusion terms
  • Major neurocognitive disorder NOS
  • Presenile dementia NOS
  • Presenile psychosis NOS
  • Primary degenerative dementia NOS
  • Senile dementia NOS
  • Senile dementia depressed or paranoid type
  • Senile psychosis NOS
Excludes2 (not part of this condition, may be coded together)
  • dementia with delirium or acute confusional state (F05)
  • mild memory disturbance due to known physiological condition (F06.8)

Inherited from F03.A (Unspecified dementia, mild)

Excludes1 (never coded together)
  • mild neurocognitive disorder due to known physiological condition with or without behavioral disturbance (F06.7-)

MS-DRG grouping when F03.A3 is the principal diagnosis

MS-DRG v44 groups for F03.A3 as principal diagnosis
MDCMS-DRGs
19 MDC 19: Mental Diseases and Disorders884

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for F03.A3 shows the full grouping logic.

CC/MCC status and inpatient edits

As a secondary diagnosis, F03.A3 is a CC under MS-DRG v44, unless the principal diagnosis is one of the 20 codes in its exclusion list. Check F03.A3 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.
  • Medicare Code Editor: age conflict: adult diagnosis (age 15 to 124).

CMS-HCC V28 risk adjustment

In the PY2027 mapping, F03.A3 maps to HCC 127 (Dementia, Mild or Unspecified). The HCC lookup shows the RAF weight and the hierarchy.

LCD billing and coding articles that list F03.A3

13 current Medicare billing and coding articles list F03.A3 among the diagnoses that support medical necessity for the services they cover.

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Frequently asked questions

What does ICD-10-CM F03.A3 mean?

F03.A3 means unspecified dementia, mild, with mood disturbance. It is one of 24 billable codes under F03, unspecified dementia.

What can't be coded with F03.A3?

Excludes1 at F03.A: mild neurocognitive disorder due to known physiological condition with or without behavioral disturbance (F06.7-). These are never reported together with F03.A3.

Which MS-DRG does F03.A3 group to?

As the principal diagnosis, F03.A3 groups to MS-DRG 884 Organic Disturbances and Intellectual Disability (MDC 19 MDC 19: Mental Diseases and Disorders) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Does F03.A3 map to an HCC?

Yes: HCC 127, Dementia, Mild or Unspecified, in the PY2027 CMS-HCC V28 mapping.

Is F03.A3 a CC or MCC?

F03.A3 is a CC under MS-DRG v44; 20 principal diagnoses exclude it.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.