ICDcodes.org
FY2027

F31.9 — Bipolar disorder, unspecified

BillableUnspecified

Is F31.9 billable?

Yes, but F31.9 is an unspecified code. F31.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, F31.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting F31.9 — the more specific alternatives are listed below.

F31.9 at a glance

CodeF31.9
DescriptionBipolar disorder, unspecified
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does F31.9 group to?

F31.9 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 885Psychosesmedical

How is F31.9 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to F31.9. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Manic depression
  • Disorder › bipolar (of)
  • Disorder › bipolar › currentepisode › depressed (of)
  • Disorder › bipolar › currentepisode › manic (of)

Inclusion terms

Alternative wording in documentation that is classified to F31.9.

  • Manic depression

Excludes1 — never code together — inherited from F31

The conditions below can never be reported together with F31.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • bipolar disorder, single manic episode (F30.-)
  • major depressive disorder, single episode (F32.-)
  • major depressive disorder, recurrent (F33.-)

Excludes2 — not included here — inherited from Chapter 5

The conditions below are not part of F31.9, but a patient may have both at the same time. When documentation supports it, F31.9 and the excluded code may both be reported.

  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Excludes2 — not included here — inherited from F31

The conditions below are not part of F31.9, but a patient may have both at the same time. When documentation supports it, F31.9 and the excluded code may both be reported.

How long has F31.9 existed?

F31.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the F31 family? (9)