2027 ICD-10-CM Diagnosis Code F45.9Somatoform disorder, unspecified

ICD-10-CM Codes›F01–F99›F40-F48›F45

ICD-10-CM F45.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F45.9 is a billable ICD-10-CM diagnosis code for somatoform disorder, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 882. Coders also document this condition as erectile dysfunction due to psychophysiologic disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Somatic disorders.

F45.9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 for payment year 2027.

Code Identity

ICD-10-CM Code
F45.9
Billable Status
Yes — Valid for Submission
Code Describes
Somatoform disorder, unspecified
Short Description
Somatoform disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
F45
Somatoform disorders

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF40-F48Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders
CategoryF45Somatoform disorders
This CodeF45.9Somatoform disorder, unspecified

Medicare Risk Adjustment (HCC)Billing

F45.9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 133 — Anxiety and Other Psychiatric Disorders
also risk-adjusts in the Part D prescription drug model (V08)

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.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Erectile dysfunction due to psychophysiologic disorder
  • Mental disorder AND/OR culture bound syndrome
  • Psychosomatic factor in physical condition
  • Psychosomatic factor in physical condition, marked psychological component
  • Psychosomatic factor in physical condition, minor psychological component
  • Psychosomatic factor in physical condition, psychological component of unknown degree
  • Somatic syndrome finding
  • Somatic syndrome present

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F45.9: its own notes plus those printed at F45 and 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.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Psychosomatic disorder NOS

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.

From F45 Somatoform disorders applies to 10 codes
  • dissociative and conversion disorders (F44.-)
  • factitious disorders (F68.1-, F68.A)
  • hair-plucking (F63.3)
  • lalling (F80.0)
  • lisping (F80.0)
  • malingering [conscious simulation] (Z76.5)
  • nail-biting (F98.8)
  • psychological or behavioral factors associated with disorders or diseases classified elsewhere (F54)
  • sexual dysfunction, not due to a substance or known physiological condition (F52.-)
  • thumb-sucking (F98.8)
  • tic disorders (in childhood and adolescence) (F95.-)
  • Tourette's syndrome (F95.2)
  • trichotillomania (F63.3)
From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F45.9, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming F45.9: its condition is not part of those codes, and both may be reported when the patient has both.

  • F41 Other anxiety disorders
    psychophysiologic disorders (F45.-) names F45.-, which includes this code
  • F93.0 Separation anxiety disorder of childhood
    nonpsychotic mental disorders (F40-F48) names F40-F48, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD011
Somatic disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Somatoform Disorders

    disorders having the presence of physical symptoms that suggest a general medical condition but that are not fully explained by another medical condition, by the direct effects of a substance, or by another mental disorder. the medically unexplained symptoms must cause clinically significant distress or impairment in social, occupational, or other areas of functioning. in contrast to factitious disorders and malingering, the physical symptoms are not under voluntary control. (apa, dsm-v)

Patient EducationClinical

Mental Disorders

Mental disorders (or mental illnesses) are conditions that affect your thinking, feeling, mood, and behavior. They may happen over a short period of time or come and go. Some can be chronic (long-lasting). They can affect your ability to relate to others and function each day..

The full article covers:

  • What are mental disorders?
  • What are some types of mental disorders?
  • What causes mental disorders?
  • Who is at risk for mental disorders?
  • How are mental disorders diagnosed?
  • What are the treatments for mental disorders?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert F45.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
300.82 Undiff somatoform disrdr
Approximate The match is approximate rather than exact.
ICD-9-CM
306.9 Psychogenic disorder NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About F45.9Overview

What is the ICD-10 code for somatoform disorder, unspecified?

The ICD-10-CM code for somatoform disorder, unspecified is F45.9 (sometimes written as F459). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is F45.9 (Somatoform disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report somatoform disorder, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does F45.9 group to?

When somatoform disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 882 (neuroses Except Depressive), which carries a relative weight of 0.9953. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of F45.9?

Under the General Equivalence Mappings, somatoform disorder, unspecified converts to ICD-9-CM 300.82 (undiff somatoform disrdr) and 306.9 (psychogenic disorder NOS). The mapping is approximate, so confirm the match fits the documentation.

Does F45.9 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: F45.9 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 (Anxiety and Other Psychiatric Disorders).