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ICD-10-CM F31.61: Bipolar disorder, current episode mixed, mild

F31.61 is the billable ICD-10-CM code for bipolar disorder, current episode mixed, mild, in category F31 (Bipolar disorder) of the Mood [affective] disorders section. As a principal diagnosis it groups to MS-DRG 885 Psychoses (MDC 19 MDC 19: Mental Diseases and Disorders). It maps to HCC 154 (Bipolar Disorders without Psychosis) in CMS-HCC V28. As a secondary diagnosis it is a CC, excluded with 293 principal diagnoses. 22 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
F31.61
billable FY2027 ICD-10-CM code
Category
F31 Bipolar disorder
Chapter
5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
CC/MCC (MS-DRG v44)
CC
CMS-HCC V28
HCC 154
POA reporting
Required

Tabular list notes for F31.61

The tabular list has no notes on F31.61 itself; the notes below apply from its parent headings.

Inherited from F31 (Bipolar disorder)

Includes
  • bipolar I disorder
  • bipolar type I disorder
  • manic-depressive illness
  • manic-depressive psychosis
  • manic-depressive reaction
  • seasonal bipolar disorder
Excludes1 (never coded together)
  • bipolar disorder, single manic episode (F30.-)
  • major depressive disorder, single episode (F32.-)
  • major depressive disorder, recurrent (F33.-)
Excludes2 (not part of this condition, may be coded together)
  • cyclothymia (F34.0)

MS-DRG grouping when F31.61 is the principal diagnosis

MS-DRG v44 groups for F31.61 as principal diagnosis
MDCMS-DRGs
19 MDC 19: Mental Diseases and Disorders885

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for F31.61 shows the full grouping logic.

CC/MCC status and inpatient edits

As a secondary diagnosis, F31.61 is a CC under MS-DRG v44, unless the principal diagnosis is one of the 293 codes in its exclusion list. Check F31.61 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.

CMS-HCC V28 risk adjustment

In the PY2027 mapping, F31.61 maps to HCC 154 (Bipolar Disorders without Psychosis). The HCC lookup shows the RAF weight and the hierarchy.

LCD billing and coding articles that list F31.61

22 current Medicare billing and coding articles list F31.61 among the diagnoses that support medical necessity for the services they cover.

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Frequently asked questions

What does ICD-10-CM F31.61 mean?

F31.61 means bipolar disorder, current episode mixed, mild. It is one of 25 billable codes under F31, bipolar disorder.

Which MS-DRG does F31.61 group to?

As the principal diagnosis, F31.61 groups to MS-DRG 885 Psychoses (MDC 19 MDC 19: Mental Diseases and Disorders) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Does F31.61 map to an HCC?

Yes: HCC 154, Bipolar Disorders without Psychosis, in the PY2027 CMS-HCC V28 mapping.

Is F31.61 a CC or MCC?

F31.61 is a CC under MS-DRG v44; 293 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.