2026 ICD-10-CM Diagnosis Code F59Unspecified behavioral syndromes associated with physiological disturbances and physical factors
ICD-10-CM Codes›F01–F99›F50-F59›F59
- Billable — Valid for Submission
- Not Chronic
F59 is a billable ICD-10-CM diagnosis code for unspecified behavioral syndromes associated with physiological disturbances and physical factors. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as behavioral syndrome associated with physiological disturbance and physical factors. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Miscellaneous mental and behavioral disorders/conditions.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Behavioral syndrome associated with physiological disturbance and physical factors
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Psychogenic physiological dysfunction NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- psychogenic - F59
- psychophysiologic - F59
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Dysfunction
- physiological NEC
- psychogenic
- Dysfunction
- psychophysiologic
- Psychological and behavioral factors affecting medical condition
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 F59 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F59Overview
Is F59 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified behavioral syndromes associated with physiological disturbances and physical factors on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of F59?
Under the General Equivalence Mappings, unspecified behavioral syndromes associated with physiological disturbances and physical factors converts to ICD-9-CM 306.8 (psychogenic disorder NEC). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
