2027 ICD-10-CM Diagnosis Code F34.9Persistent mood [affective] disorder, unspecified
ICD-10-CM Codes›F01–F99›F30-F39›F34
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
F34.9 is a billable ICD-10-CM diagnosis code for persistent mood [affective] disorder, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 885. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 293 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified mood disorders.
F34.9 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 59 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 58, ESRD (V21) category 58, ESRD (V24) category 59, and RxHCC Part D (V08) category 132 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
F34.9 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to F34.9: its own notes plus those printed at Chapter 5. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- disorders of psychological development
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name F34.9, its category, or a range that includes it.
Excludes2 4
These codes carry an Excludes2 note naming F34.9: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
emotional (persistent) F34.9
persistent F34.9
affective (mood) F34.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Mood Disorders
Most people feel sad or irritable from time to time. They may say they're in a bad mood. A mood disorder is different. It affects a person's everyday emotional state. Nearly one in ten people aged 18 and older have mood disorders. These include depression and bipolar disorder (also called manic depression).
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert F34.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F34.9Overview
What is the ICD-10 code for persistent mood [affective] disorder, unspecified?
The ICD-10-CM code for persistent mood [affective] disorder, unspecified is F34.9 (sometimes written as F349). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is F34.9 (Persistent mood [affective] disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report persistent mood [affective] disorder, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does F34.9 group to?
When persistent mood [affective] disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 885 (psychoses), which carries a relative weight of 1.3904. Higher weights mean higher Medicare reimbursement.
Is F34.9 a CC or MCC?
CMS lists F34.9 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 293 closely related codes in its exclusion list.
What is the ICD-9 equivalent of F34.9?
Under the General Equivalence Mappings, persistent mood [affective] disorder, unspecified converts to ICD-9-CM 296.99 (episodic mood disord NEC). The mapping is approximate, so confirm the match fits the documentation.
Does F34.9 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. F34.9 mapped to HCC 59 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 58 (Major Depressive/Bipolar/and Paranoid Disorders), ESRD (V21) category 58 (Major Depressive/Bipolar/and Paranoid Disorders), ESRD (V24) category 59 (Major Depressive/Bipolar/and Paranoid Disorders), and RxHCC Part D (V08) category 132 (Depression).
