ICD-10-CM Code For Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group F59 includes behavioral syndromes associated with physiological disturbances and physical factors where the presentation is unspecified, covering conditions in which psychological or behavioral symptoms are linked to medical or environmental causes rather than primary psychiatric disorders. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving behavioral or psychological manifestations secondary to physiological disturbances, capturing the relationship between medical conditions and behavioral symptoms. Accurate coding within the ICD-10-CM F59 group supports complete clinical documentation and appropriate reimbursement.

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ICD-10-CM F59: Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors Overview

This code group represents behavioral syndromes that arise in association with physiological disturbances or physical factors, where the presentation is not specified further. These conditions typically involve psychological or behavioral symptoms linked to medical or environmental causes rather than primary psychiatric disorders. Accurate coding matters for clinical records and reimbursement because it helps distinguish medically associated behavioral symptoms from primary mental health diagnoses.

When to Use

Use a code from this group when a patient presents with behavioral or psychological symptoms that are linked to an underlying physiological disturbance or physical factor and no more specific behavioral syndrome is identified. Do not use these codes when a primary psychiatric disorder is diagnosed or when a more specific secondary behavioral diagnosis is available.

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
F59	Unspecified behavioral syndromes associated with physiological disturbances and physical factors

DRG Codes

1 rows

DRG Code	Description
887	Other Mental Disorder Diagnoses

Typical Clinical Scenarios

An adult patient is brought to the emergency department after an acute episode of severe agitation, insomnia, and panic-like behavior following abrupt cessation of high-dose corticosteroid therapy; medical evaluation finds no primary psychiatric disorder and symptoms are attributed to physiological effects of medication withdrawal, prompting assignment of a behavioral syndrome diagnosis linked to a physiological disturbance. Typical codes: F59
An older inpatient on a medical floor develops new-onset sleep disturbance, appetite changes, and marked irritability in the setting of untreated hypothyroidism and electrolyte imbalance; the consult-liaison team documents that the behavioral changes are secondary to the patient’s medical condition rather than a primary psychiatric illness, so the behavioral syndrome due to physiological factors is coded. Typical codes: F59
A young adult with chronic neurological disease presents for outpatient management of persistent maladaptive eating and activity patterns thought to be driven by ongoing pain and neuroendocrine dysregulation, without meeting criteria for a specific psychiatric disorder; because the behavioral symptoms are linked to physiological disturbances and do not fit a more specific mental disorder, the unspecified behavioral syndrome code is used as a comorbid diagnosis. Typical codes: F59

Related Codes

F50-EATING-DISORDERS

ICD-10-CM Code For Eating Disorders: Group Overview

F51-SLEEP-DISORDERS-NOT-DUE-TO-SUBSTANCE

ICD-10-CM Code For Sleep Disorders Not Due To A Substance Or Known Physiological Condition: Group Overview

F52-SEXUAL-DYSFUNCTION-NOT-DUE

ICD-10-CM Code For Sexual Dysfunction Not Due To A Substance Or Known Physiological Condition: Group Overview

F53-MENTAL-AND-BEHAVIORAL-DISORDERS-ASSOCIATED-WITH-THE-PUERPERIUM

ICD-10-CM Code For Mental And Behavioral Disorders Associated With The Puerperium Not Elsewhere Classified: Group Overview

F54-PSYCHOLOGICAL-AND-BEHAVIORAL-FACTORS

ICD-10-CM Code For Psychological And Behavioral Factors Associated With Disorders Or Diseases Classified Elsewhere: Group Overview

F55-ABUSE-OF-NON-PSYCHOACTIVE-SUBSTANCES

ICD-10-CM Code For Abuse Of Non-Psychoactive Substances: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
F59	Unspecified behavioral syndromes associated with physiological disturbances and physical factors

DRG Codes

1 rows

DRG Code	Description
887	Other Mental Disorder Diagnoses

Typical Clinical Scenarios

An adult patient is brought to the emergency department after an acute episode of severe agitation, insomnia, and panic-like behavior following abrupt cessation of high-dose corticosteroid therapy; medical evaluation finds no primary psychiatric disorder and symptoms are attributed to physiological effects of medication withdrawal, prompting assignment of a behavioral syndrome diagnosis linked to a physiological disturbance. Typical codes: F59
An older inpatient on a medical floor develops new-onset sleep disturbance, appetite changes, and marked irritability in the setting of untreated hypothyroidism and electrolyte imbalance; the consult-liaison team documents that the behavioral changes are secondary to the patient’s medical condition rather than a primary psychiatric illness, so the behavioral syndrome due to physiological factors is coded. Typical codes: F59
A young adult with chronic neurological disease presents for outpatient management of persistent maladaptive eating and activity patterns thought to be driven by ongoing pain and neuroendocrine dysregulation, without meeting criteria for a specific psychiatric disorder; because the behavioral symptoms are linked to physiological disturbances and do not fit a more specific mental disorder, the unspecified behavioral syndrome code is used as a comorbid diagnosis. Typical codes: F59

Related Codes

F50-EATING-DISORDERS

ICD-10-CM Code For Eating Disorders: Group Overview

F51-SLEEP-DISORDERS-NOT-DUE-TO-SUBSTANCE

ICD-10-CM Code For Sleep Disorders Not Due To A Substance Or Known Physiological Condition: Group Overview

F52-SEXUAL-DYSFUNCTION-NOT-DUE

ICD-10-CM Code For Sexual Dysfunction Not Due To A Substance Or Known Physiological Condition: Group Overview

F53-MENTAL-AND-BEHAVIORAL-DISORDERS-ASSOCIATED-WITH-THE-PUERPERIUM

ICD-10-CM Code For Mental And Behavioral Disorders Associated With The Puerperium Not Elsewhere Classified: Group Overview

F54-PSYCHOLOGICAL-AND-BEHAVIORAL-FACTORS

ICD-10-CM Code For Psychological And Behavioral Factors Associated With Disorders Or Diseases Classified Elsewhere: Group Overview

F55-ABUSE-OF-NON-PSYCHOACTIVE-SUBSTANCES

ICD-10-CM Code For Abuse Of Non-Psychoactive Substances: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors: Group Overview

Sign up for ICD-10-CM Code For Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors: Group Overview policy alerts

ICD-10-CM F59: Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors Overview

ICD-10-CM Code For Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors: Group Overview

Sign up for ICD-10-CM Code For Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors: Group Overview policy alerts

ICD-10-CM F59: Unspecified Behavioral Syndromes Associated With Physiological Disturbances And Physical Factors Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does ICD-10-CM group `F59` represent?

When should a coder use `F59` in clinical documentation?

How does coding `F59` affect reimbursement or billing?

What related DRG is associated with `F59`?

Does `F59` indicate a primary psychiatric disorder?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does ICD-10-CM group `F59` represent?

When should a coder use `F59` in clinical documentation?

How does coding `F59` affect reimbursement or billing?

What related DRG is associated with `F59`?

Does `F59` indicate a primary psychiatric disorder?

References