Skip to content
Dx

ICD-10-CM 2027 diagnosis code

F03.C3Unspecified dementia, severe, with mood disturbance

✓ Billable / specificCC — complication/comorbidityAdult · age 15–124

F03.C3 is a valid, billable ICD-10-CM code for unspecified dementia, severe, with mood disturbance. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About F03.C3

F03.C3 is the ICD-10-CM diagnosis code for unspecified dementia, severe, with mood disturbance. It belongs to category F03 (unspecified dementia), block F01-F09 (mental disorders due to known physiological conditions) 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 F03.C (unspecified dementia, severe), F03.C3 is specifically for unspecified dementia, severe, with mood disturbance. Related codes cover without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety (F03.C0), with behavioral disturbance (F03.C1), with psychotic disturbance (F03.C2) and with anxiety (F03.C4).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 884 (Organic Disturbances and Intellectual Disability, relative weight 1.6001), 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.

The Medicare Code Editor expects this diagnosis only for patients age 15 through 124.

It was added in FY2023, effective October 1, 2022.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Unspecified dementia, severe, with mood disturbance such as depression, apathy, or anhedonia

Notes that apply from higher levels

Instructions written at a parent level also apply to F03.C3.

› From F03 Unspecified dementia
Excludes2
  • dementia with delirium or acute confusional state (F05)
  • mild memory disturbance due to known physiological condition (F06.8)

Broader instructions also apply from F01-F09 Mental disorders due to known physiological conditions and Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to F03.C3.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2023 (effective 10/1/2022): Added
  • No changes since FY2023.

Common questions about F03.C3

Is F03.C3 billable?

Yes. F03.C3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can F03.C3 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict F03.C3 as a principal diagnosis.

Is F03.C3 a CC or MCC?

F03.C3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does F03.C3 group to?

F03.C3 is used in the MS-DRG v44.0 logic for MS-DRG 884 (Organic Disturbances and Intellectual Disability). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.