F41.9 at a glance
F41.9 | |
|---|---|
Official description | Anxiety disorder, unspecified |
Billable | Yes, a valid diagnosis code for FY2027 claims |
Inclusion term | Anxiety NOS |
Category | F41, Other anxiety disorders |
Block | F40-F48, anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders |
Excludes2 (category F41) | Anxiety in acute stress reaction (F43.0), transient adjustment reaction (F43.2-), neurasthenia (F48.8), psychophysiologic disorders (F45.-) and separation anxiety (F93.0) |
Anxiety unspecified ICD-10: which words lead to F41.9
Coders follow the Alphabetic Index, so the words in your diagnosis line decide the code. For anxiety the index is less obvious than people expect. "Anxiety" on its own and "Disorder, anxiety" go to F41.9. "Anxiety state", "anxiety reaction" and "anxiety neurosis" all go to F41.1, generalized anxiety disorder, which also lists them as inclusion terms in the tabular.
Wording in the note | Code |
|---|---|
Anxiety, or anxiety disorder, with nothing more | F41.9 |
Generalized anxiety disorder, anxiety state, anxiety reaction | F41.1 |
Panic disorder, panic attack | F41.0 |
Mixed anxiety and depressive disorder, anxiety depression | F41.8 |
Social anxiety disorder | F40.10 (F40.11 if generalized) |
Anxiety disorder due to a medical condition | F06.4 |
Adjustment disorder with anxiety | F43.22 |
Separation anxiety disorder of childhood | F93.0 |
Nearby code pages: F41.1, F43.22, F43.23, F32.A and F90.0.
F41.9 or F41.1?
F41.1 needs a diagnosis of generalized anxiety disorder, or one of its index phrasings. F41.9 is for anxiety that you judge to be a disorder but haven't pinned to a type. A client at intake who describes constant worry, poor sleep and muscle tension may well end up with GAD, but until you've ruled out panic, social anxiety and a medical cause, F41.9 is the honest code.
The reverse mistake is common too. A note that says "client presents with anxiety state" reads as vague to a clinician, yet the index treats it as GAD. If you don't mean GAD, don't use that phrase.
Anxiety from a medical condition, alcohol or caffeine
When the anxiety comes from something physical, F41.9 is the wrong home. The index sends anxiety disorder due to a general medical condition, such as hyperthyroidism, to F06.4, and F06.4 has its own Excludes2 note pointing back to F40 and F41 for anxiety that isn't due to a physiological condition.
Substance‑induced anxiety codes to the substance. The index sends alcohol‑induced anxiety disorder to F10.980, cannabis to F12.980, and caffeine to F15.980, which is other stimulant use, unspecified, with stimulant‑induced anxiety disorder. Each has separate codes for abuse and dependence. If the evaluation points to four espressos a day, the code should too.
When F41.9 is the right code
- Intake or early sessions, while the differential is still open.
- A referral that says only "anxiety" and a first visit too short for a full assessment.
- A brief contact, such as a crisis call, where anxiety is clearly the problem but the type isn't established.
If you've finished the assessment and decided the anxiety doesn't fit any named disorder, the index has two choices: "Disorder, anxiety, specified NEC" leads to F41.8 when you name what the anxiety is, and F41.9 covers it when you don't.
What to document
- The anxiety in concrete terms: what the client worries about or avoids, physical symptoms, and how long it has gone on.
- A screening score with its date, such as a GAD-7.
- What you've ruled out or still need to: panic attacks, social fears, trauma, medical causes, caffeine or other substances.
- When you expect to revisit the diagnosis.
Example, fictional client. 41‑year‑old project manager referred by her primary care physician for "anxiety". Describes worrying most of the day about work and her teenage son, trouble falling asleep, and tight shoulders, for at least four months. No panic attacks reported. TSH normal per PCP letter dated last month. Drinks two coffees a day. GAD‑7 today: 12. Working diagnosis: anxiety disorder, unspecified (F41.9); assess for GAD next session and repeat GAD‑7 in four weeks.
Goals written into the treatment plan make the next review easier. Our anxiety treatment goals template has examples, and the anxiety journal gives clients something to track between sessions.
Billing F41.9
F41.9 goes on therapy and assessment claims, and in primary care on office visits where anxiety is one of several problems addressed.
CPT code | Where F41.9 shows up |
|---|---|
90791 | Diagnostic evaluation at intake |
90832, 90837 | Psychotherapy sessions, chosen by time spent |
96127 | A scored GAD-7 or similar brief questionnaire |
99213, 99214 | Primary care or psychiatric office visits for an established patient |
See 90791, 90832, 90837, 96127 and 99214.
CPT is a registered trademark of the American Medical Association. CPT codes copyright 2026 American Medical Association. All rights reserved.
Common mistakes with F41.9
- Leaving it on for the whole course of treatment. Once you've diagnosed GAD, panic disorder or social anxiety disorder, the claim should change with the note.
- Using F41.9 for anxiety that follows a clear stressor. If the picture is an adjustment disorder, code F43.22; category F41 lists anxiety in a transient adjustment reaction as an Excludes2.
- Coding F41.9 plus a depression code when you diagnosed mixed anxiety and depressive disorder. That diagnosis is F41.8.
- Missing a physical or substance cause. Anxiety due to a medical condition is F06.4, and substance-induced anxiety has its own codes under F10 to F19.
An AI scribe will write whatever diagnosis it hears, so read the assessment line before signing. Our guide to therapy progress notes in DAP, BIRP or GIRP lists what else to check.
Checked against the FY2027 ICD‑10‑CM code set from CMS on October 12, 2026. F41.9 and its index entries are the same as last year.