F41.1 ICD-10 Code: Generalized Anxiety Disorder

F41.1 at a glance

F41.1 diagnosis code: what it covers

GAD is persistent, hard‑to‑control worry about many everyday things at once, usually with physical symptoms such as muscle tension, poor sleep and fatigue. When the diagnosis line says generalized anxiety disorder, the index entries "Disorder, anxiety, generalized" and "Anxiety, generalized" both lead to F41.1.

One inclusion term matters for child and adolescent work. "Overanxious disorder" was the older name for GAD in children, and it still shows up in records from years back. The index sends "Disorder, overanxious" to F41.1, so a teenager whose childhood chart says overanxious disorder and who now meets GAD criteria keeps the same code.

F41.1 vs F41.9 and other anxiety codes

Most F41.1 coding questions are about where GAD ends and something else begins. The table sorts them by the main thing the client worries about or fears.

Two rows trip people up. Illness anxiety disorder is listed in the tabular under F45.21, hypochondriasis, and the index entry "Disorder, anxiety, illness" goes there too. A client whose worry is about having cancer, not about work, money and family all at once, is coded F45.21. The other is the word "generalized" in social anxiety. "Disorder, social, anxiety, generalized" goes to F40.11, social phobia, generalized. Someone who fears most social situations has that, not GAD.

Related pages: F41.9 for unspecified anxiety, F43.22 for adjustment disorder with anxiety and F43.20 for adjustment disorder, unspecified.

Worry, the worried well and neurasthenia

R45.82, worries, is a symptom code. It fits a visit where worry is recorded but no anxiety disorder has been diagnosed, for example in primary care. Once you diagnose GAD, the worry is part of F41.1, and the Official Guidelines say symptoms that are routinely part of a condition aren't coded on top of it.

Z71.1 covers the person who comes in afraid of a health problem that turns out not to be there; the tabular lists "worried well" as one of its inclusion terms. It describes the reason for the visit, not a disorder.

F41.1 has its own Excludes2 note for neurasthenia (F48.8), a diagnosis built around fatigue and weakness. When both really are present they can be coded together, but a client with GAD and fatigue from poor sleep only needs F41.1.

Coding GAD with depression, ADHD or PTSD

GAD often comes with another diagnosis, and the exclusion notes allow most of them. Neither category F41 nor the depression categories carry an exclusion note against the other, so F41.1 can go with F32.1, F33.1 or F34.1 when both are diagnosed. The one to watch is mixed anxiety and depressive disorder, which is a single diagnosis coded F41.8, not F41.1 plus a depression code.

ADHD's category F90 lists anxiety disorders as an Excludes2, which allows both, as in a client coded F90.0 and F41.1. PTSD is different from the stress conditions F41 does exclude: the category's Excludes2 names anxiety in acute stress reaction and adjustment reactions, not PTSD. So F43.12 and F41.1 can also be reported together when the notes describe both.

What to document for F41.1

• What the client worries about, across how many areas of life, and how hard it is to stop.
• How long it has lasted, with physical symptoms such as tension, restlessness and sleep problems.
• A dated GAD-7 or similar score, repeated so change can be shown.
• What you ruled out: panic attacks, social fears, illness-focused worry, medical causes, caffeine or other substances.
• Functional impact at work, at school or at home, and the treatment plan with measurable goals.

Example, fictional client. 46‑year‑old high school teacher, week 6 of CBT. Worry about her students' grades, her father's health and the household budget most days for over a year; reports lying awake past 1 a.m. three nights a week and tight jaw on waking. No panic attacks, no avoidance of social situations, no fixed fear of having a specific illness. GAD‑7: 15 at intake, 11 today. Practiced scheduled worry time and challenged two catastrophic predictions from the past week. Diagnosis: generalized anxiety disorder (F41.1). Plan: continue weekly CBT, add progressive muscle relaxation, repeat GAD‑7 in four weeks.

Writing goals in measurable terms helps when a payer reviews ongoing treatment. The anxiety treatment goals template has worked examples, and the anxiety journal gives clients a place to log worry between sessions.

Billing F41.1

Code pages: 90791, 90832, 90837, 96127, 99213 and 99214.

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Common mistakes with F41.1

• Coding health anxiety as GAD. Illness anxiety disorder is F45.21.
• Reading "generalized" in social anxiety disorder as GAD. That's F40.11.
• Adding R45.82 to F41.1. Worry is part of the diagnosis.
• Using F41.1 plus F32.A for mixed anxiety and depressive disorder. The single code is F41.8.
• Writing "anxiety state" when you haven't diagnosed GAD. It's an inclusion term under F41.1, so it will be coded that way.

If you use an AI scribe, it helps to say the full diagnosis out loud in session or add it before signing. Twofold's AI therapy notes let you edit the assessment line before the note is final.

Checked against the FY2027 ICD‑10‑CM code set and Official Guidelines from CMS on October 19, 2026. F41.1 did not change this year.