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F90.9ICD-10-CM

Attention-deficit hyperactivity disorder, unspecified type

BillableF90 is not billableFour Excludes2 permissionsNot restricted by age

How the code is built

F

Chapter

Mental, behavioral and neurodevelopmental disorders

90

Category

Attention-deficit hyperactivity disorders

9

Char 4

Type not specified

Chapter

F01 to F99

Mental, behavioral and neurodevelopmental disorders

Block

F90 to F98

Behavioral and emotional disorders with onset usually occurring in childhood and adolescence

Category

F90

Attention-deficit hyperactivity disorders, not billable on its own

Billable

Yes

Complete at 4 characters

Inclusion terms

ADHD NOS, and ADHD of childhood or adolescence NOS

Both classify here

Excludes2 at F90

Anxiety disorders, mood disorders, pervasive developmental disorders, schizophrenia

All four are permissions.

DefinitionCode structureClinical pictureDocumentationDecision guideTabular listComparisonClaim contextDenialsSources

Key takeaways

  • F90.9 codes ADHD when the record does not identify which presentation predominates
  • F90 is not billable, so a fourth character is always required
  • The four exclusions at F90 are all Excludes2, so anxiety, mood disorders, and autism may be reported alongside
  • Severity and remission status have no codes, so a DSM-5 severity specifier changes nothing
  • It is billable, and the friction it creates is in medication authorization rather than in claim adjudication
1Definition

What ICD-10 code F90.9 means

F90.9 is the ICD-10-CM code for attention-deficit hyperactivity disorder, unspecified type. It applies when a provider has diagnosed ADHD, but the documentation does not identify whether inattention, hyperactivity, or both predominate.

Two inclusion terms sit at this code, and the pair matters. One is attention-deficit hyperactivity disorder of childhood or adolescence NOS. The other is simply attention-deficit hyperactivity disorder NOS, with no age qualifier at all. So despite the block title referring to disorders with onset usually occurring in childhood and adolescence, this code is not restricted by age. Adult ADHD classifies here, and the code carries no age edit.

Code

F90.9

Descriptor

Attention-deficit hyperactivity disorder, unspecified type

Chapter

Mental, behavioral and neurodevelopmental disorders

Block

Behavioral and emotional disorders with onset usually occurring in childhood and adolescence

Category

F90, attention-deficit hyperactivity disorders

Billable

Yes

Inclusion terms

ADHD NOS, ADHD of childhood or adolescence NOS

Includes F90

Attention deficit disorder with hyperactivity, attention deficit syndrome with hyperactivity

F90 itself is the category header and cannot go on a claim. A fourth character is always required, and which one applies depends on the wording the provider controls.

2Code structure

One axis, and two clinical variables it does not capture

F90.9 has no subdivisions. The fourth character records which presentation predominates, and nothing else.

The presentation axis, in full

Not specified

F90.9

This code

Predominantly inattentive

F90.0

Predominantly hyperactive

F90.1

Combined

F90.2

Other type

F90.8

What the code does not capture

Mild, moderate, or severe

None, since no severity character exists

In partial remission

None

Age at onset or current age

None

Which symptom count was met

None

Comorbid conditions

None, but each is separately reportable

Current medication

None, but a long-term drug therapy status code may apply

A terminology mismatch is worth knowing about. The current diagnostic manual describes ADHD in terms of *presentations* — predominantly inattentive presentation, predominantly hyperactive-impulsive presentation, combined presentation. ICD-10-CM uses *type*. The mapping between them is direct, so a note documenting a predominantly inattentive presentation supports F90.0. What it does not support is F90.9.

The same manual assigns a severity specifier and a partial remission qualifier. Neither has anywhere to go in ICD-10-CM. A note reading moderate ADHD, combined presentation, produces F90.2, and the word moderate is simply not captured.

One documentation ambiguity has no clean answer. A chart reading only ADD, meaning attention deficit disorder without a statement about hyperactivity, is genuinely ambiguous. The category includes attention deficit disorder *with* hyperactivity as an inclusion term, and the inattentive-type code is where a presentation without hyperactivity would sit. Practices differ, and the reliable route is a query rather than a house convention.

3Clinical picture

Clinical findings documented under F90.9

A record supporting this code describes inattention, hyperactivity, or both, with functional impact, and does not establish which predominates.

Inattention

Distractibility, careless errors, difficulty sustaining attention, losing items, forgetfulness

Hyperactivity

Fidgeting, difficulty remaining seated, excessive movement, talkativeness

Impulsivity

Interrupting, difficulty waiting, acting without forethought

Onset and course

Symptoms present before age 12, persisting across more than one setting

Functional impact

Effect on school, work, relationships, or daily functioning

Rating scales

Scores from a standardized instrument, with the instrument named and the informant identified

Comorbidity

Learning disorders, anxiety, mood disorders, tic disorders, autism spectrum disorder

Rating scale results are the finding most likely to resolve the type. Instruments report inattentive and hyperactive-impulsive subscales separately, so a completed scale usually contains the information the code is missing.

4Documentation

What the chart must show

  • A provider-stated diagnosis of ADHD
  • Which presentation predominates, or an explicit statement that it cannot be determined
  • Symptoms in each domain, with the settings in which they occur
  • Onset, and evidence that symptoms predate age 12
  • Functional impairment, since impairment is what separates the disorder from ordinary variation
  • Rating scale results, with the instrument and the informant identified
  • Consideration of alternative and comorbid explanations
  • Current medication and the monitoring plan

The specificity is usually already in the chart. A completed rating scale with separate subscale scores, or a note describing a child who cannot sit still and cannot focus, contains what is needed to reach F90.2. The gap is between the assessment line and the rest of the note.

5Decision guide

When to assign F90.9, and when not to

ADHD, presentation not stated

F90.9

ADHD, predominantly inattentive presentation

F90.0

ADHD, predominantly hyperactive-impulsive presentation

F90.1

ADHD, combined presentation

F90.2

ADHD, another named type

F90.8

Attention deficit disorder, with no statement about hyperactivity

Query, since the term is ambiguous in this category

ADHD with a documented severity or remission specifier

The applicable type code, since neither specifier is captured

ADHD and anxiety

F90.9 plus the anxiety code

ADHD and a mood disorder

F90.9 plus the mood disorder code

ADHD and autism spectrum disorder

F90.9 plus the F84 code

Attention or concentration deficit as a symptom, with no ADHD diagnosis

The symptom code, not F90.9

Oppositional defiant disorder or a conduct disorder

The F91 code, reportable alongside

A specific learning disorder

The F81 code, reportable alongside

There is no sequencing rule attached to F90.9. The decision is about which presentation the record supports, and whether comorbid conditions are being reported as they should be.

Query rather than default when a rating scale in the chart reports subscale scores the assessment never used, and when the note says only ADD.

6Tabular list

Instructional notes at F90 and above

Includes at F90

Attention deficit disorder with hyperactivity, attention deficit syndrome with hyperactivity

Inclusion terms at F90.9

Attention-deficit hyperactivity disorder NOS, attention-deficit hyperactivity disorder of childhood or adolescence NOS

Excludes2 at F90

Anxiety disorders (F40.-, F41.-)

Excludes2 at F90

Mood affective disorders (F30 to F39)

Excludes2 at F90

Pervasive developmental disorders (F84.-)

Excludes2 at F90

Schizophrenia (F20.-)

Every exclusion at F90 is an Excludes2, and there is no Excludes1 anywhere in the category. That means nothing on that list is prohibited alongside F90.9. The four conditions named are permissions.

That list is also, not coincidentally, the set of conditions that most often accompany ADHD. Anxiety and mood disorders are common comorbidities, and the classification says explicitly that both may be reported with an ADHD code.

The pervasive developmental disorders entry deserves its own note. Autism spectrum disorder is classified under F84, and a previous edition of the diagnostic manual prohibited diagnosing ADHD and autism together. That prohibition was removed in the current edition, and ICD-10-CM never had one — the note is an Excludes2, which is a permission. Clinicians and coders trained under the older rule still drop one of the two codes, and the classification does not require that.

7Comparison

Codes frequently confused with F90.9

F90.0

Descriptor

ADHD, predominantly inattentive type

Use instead when

Inattention predominates

F90.1

Descriptor

ADHD, predominantly hyperactive type

Use instead when

Hyperactivity predominates

F90.2

Descriptor

ADHD, combined type

Use instead when

Both domains are documented

F90.8

Descriptor

ADHD, other type

Use instead when

Another named type is documented

F40.-, F41.-

Descriptor

Phobic and other anxiety disorders

Use instead when

Anxiety is documented, reportable alongside

F30 to F39

Descriptor

Mood affective disorders

Use instead when

A mood disorder is documented, reportable alongside

F84.-

Descriptor

Pervasive developmental disorders, including autism spectrum disorder

Use instead when

Autism is documented, reportable alongside

F20.-

Descriptor

Schizophrenia

Use instead when

Schizophrenia is documented, reportable alongside

F91.3

Descriptor

Oppositional defiant disorder

Use instead when

Oppositional defiant disorder is documented, reportable alongside

F91.-

Descriptor

Other conduct disorders

Use instead when

A conduct disorder is documented, reportable alongside

F81.-

Descriptor

Specific developmental disorders of scholastic skills

Use instead when

A learning disorder is documented, reportable alongside

F95.-

Descriptor

Tic disorders

Use instead when

A tic disorder is documented, reportable alongside

F98.8

Descriptor

Other specified behavioral and emotional disorders with onset usually occurring in childhood and adolescence

Use instead when

Another childhood behavioral disorder is documented

R41.840

Descriptor

Attention and concentration deficit

Use instead when

Attention deficit is documented as a symptom without an ADHD diagnosis

F51.- , G47.-

Descriptor

Sleep disorders

Use instead when

A sleep disorder is documented, which can present similarly

Z79.-

Descriptor

Long-term current drug therapy

Use instead when

Reported additionally for a patient on ongoing medication

The R41.840 row is the important one. Attention and concentration deficit is a symptom code, and it is the right answer when a patient reports difficulty concentrating and no ADHD diagnosis has been made. Reaching for F90.9 in that situation records a disorder the record has not established.

8Claim context

Services commonly reported with F90.9

F90.9 supports pediatric and adult evaluation and management, psychiatric diagnostic evaluation, psychological and neuropsychological testing, psychotherapy, behavioral interventions with caregivers, and the ongoing medication management that follows a diagnosis.

The coverage picture for this code differs from most in this glossary, and it is worth saying why. ADHD is predominantly diagnosed and managed in children and working-age adults, so the Medicare determinations that govern coverage on most diagnosis pages rarely apply. What governs here is commercial plan medical policy, Medicaid policy including the pediatric benefit requirements, and school-based service rules where those are involved.

The friction is in medication authorization, not in claim adjudication. Claims carrying F90.9 generally pay. Stimulant and non-stimulant prior authorization is where the unspecified code creates delay, because utilization review commonly asks for the presentation, the rating scale results, the functional impairment, and the treatment history. An unspecified diagnosis satisfies none of those questions, and the request comes back for documentation the chart already contains.

Behavioral health benefits are also frequently administered by a carve-out rather than the medical plan, which means the authorization criteria, the network, and the appeal path may all sit with a different organization than the one paying the medical claims. Where a commercial or Medicaid managed care plan applies visit limits or authorization requirements to behavioral health that it does not apply to medical benefits, that is a parity question with its own complaint path.

9Denials

Coding errors that cause denials

Coding F90.9 when a rating scale in the chart reports the subscales

Assign the type the scale supports

Coding F90.9 when the note documents a presentation using diagnostic manual wording

Map the presentation to the corresponding type code

Dropping the autism code because ADHD is coded

Report both, since the note is an Excludes2

Dropping the anxiety or mood disorder code on an assumed conflict

Report both, since those notes are Excludes2

Submitting F90 without a fourth character

Complete the code, since the category is not billable

Coding F90.9 for a documented attention or concentration complaint with no diagnosis

Assign the symptom code

Requesting medication authorization under F90.9

Report the presentation and supply the scale results and functional impairment

Searching for a severity or remission character

Assign the type code, since neither is captured

Assuming the code does not apply to adults

Assign it, since one inclusion term carries no age qualifier

Omitting the long-term drug therapy status code

Report it for a patient on ongoing medication

10Sources

Where to verify F90.9

ICD-10-CM Official Guidelines for Coding and Reporting

The Excludes1 and Excludes2 definitions, and the conventions on unspecified codes and on coding symptoms versus confirmed diagnoses

ICD-10-CM Tabular List at F90 and the F90 to F98 block

The Includes list, the two inclusion terms at F90.9, and the four Excludes2 notes

ICD-10-CM Alphabetic Index at Disorder, attention-deficit hyperactivity

The routing of the unqualified term and of the subtype wording

CMS ICD-10 code page and the FY 2026 files

Current code files and the annual addenda

Mental health parity requirements

Whether authorization rules and visit limits applied to behavioral health may be more restrictive than those applied to medical and surgical benefits

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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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