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F41.9ICD-10-CM

Anxiety disorder, unspecified

BillableNo Excludes1 at the categoryF41.2 does not exist in ICD-10-CM

How the code is built

F

Chapter

Mental, behavioral and neurodevelopmental disorders

41

Category

Other anxiety disorders

9

Char 4

Disorder type not specified

Chapter

F01 to F99

Mental, behavioral and neurodevelopmental disorders

Block

F40 to F48

Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders

Category

F41

Other anxiety disorders

Billable

Yes

Complete at 4 characters

Inclusion term

Anxiety NOS

The index default for an unqualified anxiety diagnosis

Excludes notes

Excludes2 only

Every note at F41 is a permission, not a prohibition

DefinitionCode structureClinical pictureDocumentationDecision guideTabular listComparisonClaim contextDenialsSources

Key takeaways

  • F41.9 codes anxiety when a provider diagnoses an anxiety disorder but names no specific type
  • Assign it when symptoms are documented but do not establish generalized anxiety, panic, or a phobia
  • Anxiety NOS is classified here, which makes F41.9 the default for an unqualified anxiety diagnosis
  • A disorder must be diagnosed, since nervousness alone is a symptom rather than a disorder
  • It is billable, and it is the code payers most expect to be replaced as the clinical picture develops
1Definition

What ICD-10 code F41.9 means testing

F41.9 is the ICD-10-CM code for anxiety disorder, unspecified. It applies when a provider has diagnosed an anxiety disorder, but the documentation does not identify which one, either because the presentation does not meet criteria for a named disorder or because the evaluation is still underway.

Anxiety NOS is classified here, which makes F41.9 the destination for a note that says only anxiety. What the code does not carry is any statement about chronicity, severity, or cause. It says the disorder type is undetermined and nothing more.

Code

F41.9

Descriptor

Anxiety disorder, unspecified

Chapter

Mental, behavioral and neurodevelopmental disorders

Block

Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders

Category

F41, other anxiety disorders

Billable

Yes

Inclusion term

Anxiety NOS

Excludes notes at F41

Excludes2 only, covering acute stress reaction, adjustment reaction, neurasthenia, psychophysiologic disorders, and separation anxiety.

One fact settles a recurring dispute. There is no F41.2 in ICD-10-CM. The World Health Organization's ICD-10 uses F41.2 for mixed anxiety and depressive disorder, and clinicians trained on international references reach for it regularly. The United States clinical modification never adopted it, so F41.2 will be rejected on a claim. The valid children of F41 are F41.0, F41.1, F41.3, F41.8, and F41.9.

2Code structure

Three questions, none answered inside this code

F41.9 has no subdivisions. There is no fifth character and no severity axis. Specificity for anxiety lives entirely in neighboring categories, and reaching it means answering three separate questions.

Is it a disorder, or a symptom?

A diagnosed anxiety disorder

F40 to F41

Nervousness reported as a symptom

R45.0

Is it primary, medical, or substance-related?

No external cause, primary anxiety

F41.-

A known physiological condition, such as a thyroid disorder

F06.4

A substance, including alcohol, stimulants, or sedatives

The substance category, with the induced-anxiety character

Which disorder is it?

Type not determined

F41.9

Generalized anxiety disorder

F41.1

Panic disorder

F41.0

Mixed anxiety disorders

F41.3

Agoraphobia, social phobia, or a specific phobia

F40.-

Anxiety following an identifiable stressor

F43.-

A note on stale references. Older code lists show F41.0 as panic disorder without agoraphobia. The current descriptor drops that qualifier, and agoraphobia now carries its own codes at F40.0-, including one that specifies agoraphobia with panic disorder. Encounter forms built before that change route panic presentations incorrectly.

3Clinical picture

Clinical findings documented under F41.9

A record supporting this code describes anxiety with functional impact, without establishing which disorder produced it.

Cognitive

Excessive worry, apprehension, difficulty concentrating, intrusive fear

Physical

Restlessness, muscle tension, fatigue, palpitations, sweating, trembling

Sleep

Difficulty falling or staying asleep

Behavioral

Avoidance, reassurance-seeking, reduced activity

Screening

Scores from a standardized anxiety instrument, recorded with the instrument named

Function

Impairment in work, school, relationships, or daily activities

What keeps an encounter at F41.9 is the absence of a pattern that names itself. Discrete panic attacks point to F41.0. Persistent worry across multiple domains over months points to F41.1. Fear tied to a specific object or situation points to F40.-.

4Documentation

What the chart must show

  • A provider-stated diagnosis of an anxiety disorder, distinguished from anxiety as a symptom
  • The symptoms observed, with duration and frequency
  • Functional impairment, which is what separates a disorder from ordinary worry
  • Screening or assessment results, with the instrument identified and the score recorded
  • Consideration of a medical cause, since anxiety attributable to a physiological condition codes elsewhere
  • Substance and medication history, since substance-induced anxiety codes elsewhere again
  • A statement that the presentation does not meet criteria for a specific disorder, or that evaluation continues
  • Treatment and follow-up plan, including therapy, medication, or referral

The defect auditors look for is a chart where F41.9 persists across many visits while the notes describe a consistent, nameable pattern. An unspecified code is defensible at intake and progressively harder to defend after that.

5Decision guide

When to assign F41.9, and when not to

Anxiety disorder, type not specified

F41.9

Generalized anxiety disorder

F41.1

Panic disorder or panic attacks

F41.0

Mixed anxiety and depressive features, US claim

F41.8 or the separate anxiety and depression codes, never F41.2

Agoraphobia, with or without panic

F40.0-

Social phobia

F40.1-

A specific phobia

F40.2-

Obsessive-compulsive symptoms

F42.-

Post-traumatic stress disorder

F43.1-

Anxiety following an identifiable life stressor

F43.2-, adjustment disorders

Acute reaction to an exceptional stressor

F43.0

Anxiety caused by a medical condition

F06.4, with the underlying condition coded

Anxiety caused by a substance

The substance code carrying the induced-anxiety character

Nervousness, no disorder diagnosed

R45.0

Separation anxiety in a child

F93.0

There is no sequencing rule attached to F41.9 itself. The decision is entirely about specificity and attribution, which is why the query matters more here than the code order.

Query rather than default when the note documents discrete attacks, a consistent trigger, a recent stressor, an untreated thyroid or cardiac condition, or a substance history that the assessment never connected to the anxiety.

6Tabular list

Instructional notes at F41

Excludes2 at F41

Anxiety in acute stress reaction (F43.0)

Excludes2 at F41

Anxiety in transient adjustment reaction (F43.2)

Excludes2 at F41

Neurasthenia (F48.8)

Excludes2 at F41

Psychophysiologic disorders (F45.-)

Excludes2 at F41

Separation anxiety (F93.0)

This is the most misreported fact about F41.9. The F41 category carries no Excludes1 notes at all. Several published guides describe Excludes1 restrictions here and warn about automatic claim denials from mutually exclusive pairs. The tabular list does not support that. Every note at F41 is an Excludes2, which means the excluded condition is not part of F41, but a patient may carry both, and both may be reported when the documentation supports them.

The practical effect is that a patient with an adjustment disorder and a separate anxiety disorder can be reported with codes from both categories. The constraint on F41.9 is documentation specificity, not code-pair edits.

7Comparison

Codes frequently confused with F41.9

F41.0

Descriptor

Panic disorder [episodic paroxysmal anxiety]

Use instead when

Discrete panic attacks are documented

F41.1

Descriptor

Generalized anxiety disorder

Use instead when

Persistent, generalized worry with associated symptoms is documented

F41.3

Descriptor

Other mixed anxiety disorders

Use instead when

Mixed anxiety features are documented without a dominant type

F41.8

Descriptor

Other specified anxiety disorders

Use instead when

The type is named but has no dedicated code

F40.0-

Descriptor

Agoraphobia, with or without panic disorder

Use instead when

Fear of situations where escape is difficult is documented

F40.1-

Descriptor

Social phobias

Use instead when

Fear of social or performance situations is documented

F40.2-

Descriptor

Specific (isolated) phobias

Use instead when

Fear is tied to a specific object or situation

F42.-

Descriptor

Obsessive-compulsive disorder

Use instead when

Obsessions or compulsions are documented

F43.0

Descriptor

Acute stress reaction

Use instead when

An acute reaction to an exceptional stressor is documented

F43.1-

Descriptor

Post-traumatic stress disorder

Use instead when

Trauma-related symptoms meeting PTSD criteria are documented

F43.2-

Descriptor

Adjustment disorders

Use instead when

Anxiety follows an identifiable stressor and is coded to the adjustment subtype

F06.4

Descriptor

Anxiety disorder due to known physiological condition

Use instead when

A medical condition is documented as the cause

F48.8

Descriptor

Other specified nonpsychotic mental disorders

Use instead when

Neurasthenia is documented, which is classified here

F45.-

Descriptor

Somatoform disorders

Use instead when

Physical symptoms without medical explanation dominate the picture

F93.0

Descriptor

Separation anxiety disorder of childhood

Use instead when

Separation anxiety is documented in a child

R45.0

Descriptor

Nervousness

Use instead when

Nervousness is reported as a symptom with no disorder diagnosed

8Claim context

Services commonly reported with F41.9

F41.9 supports outpatient behavioral health and primary care alike. It appears behind psychotherapy sessions, evaluation and management visits with a psychotherapy add-on, psychiatric diagnostic evaluations, collaborative care management, and brief emotional and behavioral assessment when a standardized instrument is administered and scored.

The friction sits in authorization rather than adjudication. Behavioral health benefits are frequently carved out to a separate administrator, and utilization review for continued psychotherapy often asks for a specific diagnosis, a treatment plan tied to it, and evidence of progress. An unspecified diagnosis carried across many sessions is a common reason continued authorization stalls, even when individual claims pay.

Telehealth rules, session frequency limits, and the credentials permitted to render each service vary by payer and by state. Confirm the applicable coverage policy before submitting an extended course of treatment under this code.

9Denials

Coding errors that cause denials

Submitting F41.2 for mixed anxiety and depression

Use F41.8 or separate anxiety and depression codes, since F41.2 is not valid in ICD-10-CM

Defaulting to F41.9 when the note documents panic attacks or generalized worry

Assign F41.0 or F41.1 to match the documented pattern

Coding F41.9 when a medical condition is documented as the cause

Assign F06.4 and code the underlying condition

Coding F41.9 when anxiety is substance-induced

Assign the substance code carrying the induced-anxiety character

Assigning F41.9 for nervousness with no diagnosed disorder

Assign R45.0, since a symptom is not a disorder

Carrying F41.9 unchanged across an extended course of therapy

Update the diagnosis as the evaluation refines it

Using an encounter form that still shows panic disorder without agoraphobia

Update to the current F41.0 descriptor and the F40.0- agoraphobia codes

Avoiding a second code because of an assumed Excludes1 conflict

Check the tabular list, since F41 carries only Excludes2 notes

10Sources

Where to verify F41.9

ICD-10-CM Official Guidelines for Coding and Reporting

Conventions on unspecified codes and on coding symptoms versus confirmed diagnoses

The ICD-10-CM Tabular List at F41, F40, and F43

The Excludes2 notes, the valid children of F41, and the current F41.0 descriptor

The CMS ICD-10 code page

Current code files and the annual addenda

AHA Coding Clinic

Published advice on anxiety attributable to medical conditions and on substance-induced disorders

Medicare Benefit Policy Manual (Pub. 100-02) chapter index

Authorization criteria, session limits, and rendering provider requirements, which often sit with a carve-out administrator rather than the medical plan

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Last reviewed August 2026

This page is a free reference for billing and coding teams and is not coding, legal, or clinical advice. Code selection depends on the documentation in the record and on the policy of the payer being billed. Verify every code, instructional note, and sequencing rule against the current ICD-10-CM files and the Official Guidelines for Coding and Reporting for the applicable date of service. ICD-10-CM is maintained by the CDC's National Center for Health Statistics and published by CMS. CPT is a registered trademark of the American Medical Association. TruCare is not affiliated with CMS, NCHS, the AHA, or the AMA.

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