ADHD Diagnostic Codes: ICD-10 and DSM-5 Explained

Table of Contents

1. Why do diagnostic codes matter?
2. What are the DSM-5 / ICD-10 codes for ADHD?
3. What about ICD-11?
4. How do you find your own diagnostic code?
5. Can your ADHD code change over time?
6. What about ADHD comorbidities?
7. How do diagnostic codes affect accommodations?

Why do diagnostic codes matter?

A diagnostic code is a standardized identifier for a medical condition. ADHD codes are used in three main contexts:

1. Insurance and billing. When a clinician submits a claim for an ADHD evaluation, treatment, or medication prescription, they include the diagnostic code so the insurance company can process it. Without a code, no reimbursement.

2. Medical and educational records. Your code appears in your patient chart, on prescription notes, in school IEPs and 504 plans, and on accommodation documentation. It’s how your diagnosis travels between providers and institutions.

3. Research and statistics. Public health data, clinical trials, and epidemiology rely on consistent codes. The CHADD prevalence statistics are built on F90.x diagnoses.

If you’ve ever been diagnosed with ADHD, you have a code. It might be on your evaluation report, on prescription paperwork, or in your insurance EOB (explanation of benefits). Most patients never look – but it’s there.

What are the DSM-5 / ICD-10 codes for ADHD?

The DSM-5 (Diagnostic and Statistical Manual, 5th edition – used in US clinical practice) and ICD-10 (International Classification of Diseases, 10th edition – used worldwide) share the F90.x code family for ADHD. This alignment was done so US clinicians could bill internationally consistent codes.

The five ADHD codes:

F90.0 – ADHD, predominantly inattentive presentation

• Difficulty sustaining attention
• Forgetfulness, distractibility
• Trouble following instructions
• Poor organization
• Hyperactivity is minimal or absent
• This is the presentation most often missed in girls and women

F90.1 – ADHD, predominantly hyperactive-impulsive presentation

• Restlessness, fidgeting, can’t sit still
• Excessive talking, interrupting
• Acting without thinking
• Inattention is minimal
• Less common in adults; more common in young children

F90.2 – ADHD, combined presentation

• Both inattentive AND hyperactive-impulsive symptoms
• The most common presentation overall
• Roughly 50-60% of ADHD diagnoses

F90.8 – ADHD, other specified presentation

• Used when symptoms cause significant impairment but don’t quite fit a single subtype
• Less commonly used

F90.9 – ADHD, unspecified presentation

• Used when there’s not enough information to assign a more specific code
• Often a temporary code while evaluation continues

Most adults with ADHD have F90.0 (inattentive) or F90.2 (combined). F90.1 (purely hyperactive) is rare in adults – most adults who were hyperactive as kids develop more inattentive features over time.

What about ICD-11?

The World Health Organization released ICD-11 in 2018, with full implementation starting 2022. Many countries are still in the transition period and haven’t fully adopted it yet.

ICD-11 uses a different code structure for ADHD:

• 6A05 – Attention deficit hyperactivity disorder (the umbrella code)
• 6A05.0 – ADHD, predominantly inattentive presentation
• 6A05.1 – ADHD, predominantly hyperactive-impulsive presentation
• 6A05.2 – ADHD, combined presentation
• 6A05.Y – Other specified presentation
• 6A05.Z – Unspecified presentation

The categories are essentially the same as F90.x – same symptoms, same presentations, just different numbering. If your country has adopted ICD-11, you’ll see 6A05.x on newer paperwork.

In the US, healthcare is still dominated by ICD-10-CM (the US-modified version of ICD-10), so you’ll most often see F90.x. The DSM-5-TR (2022 text revision) continues to use the F90.x codes.

How do you find your own diagnostic code?

Four places to look:

1. Your evaluation report. Most ADHD evaluations from a psychiatrist, psychologist, or pediatrician include the code at the top or bottom of the diagnosis section. Look for “F90.x” or “ICD-10:” or “DSM-5:”.

2. Insurance EOBs. Every claim filed to insurance includes the diagnostic code. Log into your insurance portal and look at recent claims for ADHD-related visits or prescriptions.

3. Pharmacy records. Some pharmacies print the diagnostic code on prescription documentation, especially for stimulant medications.

4. Just ask. Email or call your clinician’s office: “Can you tell me what diagnostic code you have for my ADHD?” They have it in your chart and can share it.

If you’ve never been formally diagnosed but suspect you have ADHD, you don’t have a code yet. A formal evaluation by a qualified clinician (psychiatrist, psychologist, or specially trained primary care doctor) is required to assign one. The National Institute of Mental Health has a guide on what evaluation involves.

Can your ADHD code change over time?

Yes – and it often does, especially from childhood to adulthood.

The most common shift: childhood F90.1 (hyperactive-impulsive) or F90.2 (combined) often becomes adult F90.0 (inattentive). This isn’t because your ADHD got “better” – it’s because hyperactivity tends to internalize with age.

The fidgeting becomes restless thoughts. The blurting becomes interrupting in your head and choosing not to say it.

Other reasons codes change:

• Your clinician reassesses based on new information
• You switch from a pediatric to an adult provider
• The diagnostic system itself updates (DSM-IV used “ADHD types” – DSM-5 uses “presentations”)
• You’re rediagnosed in a different country using a different system

Don’t worry about the code changing. It doesn’t mean your earlier diagnosis was wrong. It reflects how ADHD evolves over a lifetime.

What about ADHD comorbidities?

Many ADHD adults have additional diagnoses with their own codes. Common ones:

• F32.x – Major depressive disorder (depression – common in ADHD)
• F41.x – Anxiety disorders
• F84.0 – Autism spectrum disorder (high overlap with ADHD)
• F50.x – Eating disorders
• F51.x – Sleep disorders
• F60.x – Personality disorders

According to the NIMH, adults with ADHD are more likely to experience depression and have elevated rates of anxiety, autism, and substance use. Multiple codes on your record is the rule, not the exception.

How do diagnostic codes affect accommodations?

Your code is the gatekeeper to most formal accommodations.

School (US): An IEP (Individualized Education Program) or 504 Plan typically requires a documented diagnosis with code. F90.x is sufficient documentation for most ADHD-related school accommodations.

College (US): Disability Services offices typically require recent (within 5 years) documentation of ADHD with the diagnostic code. Common accommodations: extended test time, distraction-reduced testing environments, note-taking support.

Workplace (US): ADA accommodations require ADHD documentation. The diagnostic code appears in the medical statement provided to HR. (You don’t have to disclose the specific code to your employer – only that you have a documented disability.)

Insurance for medication: Stimulant medications (Adderall, Ritalin, Vyvanse, Concerta) require the F90.x code on the prescription claim for insurance to cover them.

Disability benefits (severe cases): SSI/SSDI applications for ADHD-related disability require extensive documentation including the code, treatment history, and functional impact.

FAQ

Is there a separate ADHD code for adults vs children?

No. The same F90.x codes apply across the lifespan. The DSM-5 changed the language from “ADHD in children” to “ADHD” without age qualifier in 2013 – recognizing that ADHD persists into adulthood.

What’s the difference between ADD and ADHD codes?

“ADD” (attention deficit disorder, no hyperactivity) was an older DSM-III term. It’s not used in current diagnostic coding. What was once called “ADD” is now F90.0 (ADHD, predominantly inattentive presentation).

Can I have ADHD without a diagnostic code?

Self-suspected ADHD without formal evaluation has no code. To get a code, you need a clinician’s formal diagnosis. Many adults strongly suspect ADHD for years before pursuing evaluation – the suspicion is real, but it’s not “official” until coded.

What’s a “rule out” diagnosis?

“R/O F90.x” means “considering ADHD but not yet confirmed.” It’s a placeholder while evaluation is ongoing. Once the evaluation completes, it’s either replaced with the actual F90.x code or removed if ADHD is ruled out.

Do other countries use different codes?

Most countries use ICD codes (F90.x in ICD-10, 6A05.x in ICD-11). The US is unusual in also using DSM-5, which mirrors ICD-10. Australia uses ICD-10-AM.

Canada uses ICD-10-CA. The codes are similar enough that the diagnosis travels internationally.

If I had ADHD as a child, do I still have the code?

Yes – the diagnosis persists in your medical record unless formally removed. Many adults find their childhood F90.x diagnosis still in their chart decades later.

The Bottom Line

Your ADHD diagnostic code is a small string of characters that unlocks insurance coverage, accommodations, and treatment access. F90.0, F90.1, F90.2, F90.8, F90.9, or in newer systems 6A05.x.

If you don’t know yours, ask your clinician. It’s already in your chart. Knowing it makes navigating insurance and accommodations dramatically easier.

For broader context on adult ADHD diagnosis, see our ADHD glossary and research synthesis. For the specific question of late-diagnosis (which often comes with rediscovering your code on old paperwork), more is coming in future guides.

Related articles

• ADHD or ADD: What’s the Difference (And Why It Matters)
• ADHD vs ADD: 5 Symptom Differences That Matter

ADI BEN ELYAHU

Adi Ben Elyahu is the founder of FOCO and RemindHer – apps focused on reducing mental overload and helping overwhelmed minds start more easily.