F43.20: Adjustment disorder, unspecified

The ICD-10-CM code for adjustment disorder when the provider documents the diagnosis without stating which emotional or behavioral subtype predominates.

Billable

FY2027

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At a glance

Code Family

F43.2: Adjustment disorders

Condition

Adjustment disorder

HCC Mapping (v28)

None. F43.20 maps to no HCC category in CMS-HCC v28 and makes no RAF contribution.

DRG Grouping

MS-DRG 882, Neuroses Except Depressive, under MDC 19 in the FY2027 MS-DRG v44 grouper.

Billable

Yes. F43.20 is valid for HIPAA-covered transactions.

Family Specificity

Seven billable child codes under F43.2, split on the predominant symptom pattern documented, with F43.20 as the residual when no subtype is stated.

Which F43.2 code do I assign?

The F43.2 family splits on the predominant symptom pattern the provider documents, not on the severity of the stressor. Reserve F43.20 for notes that record adjustment disorder without naming a depressed, anxious, conduct or other symptom type.

When documentation says…

Code

Adjustment disorder, subtype not stated

F43.20

Adjustment disorder where the note names no predominant symptom pattern. The record must still show an identifiable stressor, symptom onset within 3 months of that stressor, and clinically significant distress or functional impairment.

Adjustment disorder with depressed mood

F43.21

Adjustment disorder where depressed mood predominates. The provider must document the depressed mood as the leading symptom, and the diagnosis must be adjustment disorder rather than a depressive disorder.

Adjustment disorder with anxiety

F43.22

Adjustment disorder where anxiety predominates. The note must identify anxiety as the leading symptom of the reaction to the documented stressor.

Adjustment reaction with both anxious and depressed symptoms

F43.23

Adjustment disorder with mixed anxiety and depressed mood. The note must document both symptom patterns as present in the same reaction.

Adjustment disorder with disturbance of conduct

F43.24

Adjustment disorder where a conduct disturbance predominates. The record must describe the behavioral disturbance rather than an emotional presentation alone.

Adjustment disorder with mixed emotional and behavioral features

F43.25

Adjustment disorder with mixed disturbance of emotions and conduct. The note must document both an emotional symptom pattern and a conduct disturbance.

Adjustment disorder with other specified symptoms

F43.29

Adjustment disorder with a documented symptom type that falls outside the depressed, anxious, mixed and conduct categories. The note must name the symptom type, because an unnamed type directs the encounter back to F43.20.

Tabular notes

EXCLUDES2

Excludes2: F93.0, separation anxiety disorder of childhood, at the parent F43.2 subcategory. An Excludes2 note indicates that the excluded condition is distinct but may coexist. Both codes may be reported when each is independently diagnosed and documented.

FY2027: EFFECTIVE 1 OCTOBER 2026

F43.20 is unchanged in the FY2027 update. The FY2027 codes and tabular addenda change nothing in category F43, and the Excludes2 note for F93.0 at F43.2 stands.

Operational & financial impact

Why specificity matters beyond the chart: risk adjustment, DRG assignment and denial exposure all follow from which code is selected.

CMS-HCC v28 (PY2024+)

F43.20 maps to no HCC category in CMS-HCC v28. It also mapped to no HCC category in v24.

F43.20 makes no RAF contribution. Adjustment disorder is not an HCC-mapped diagnosis in either model version.

Comorbid depressive or anxiety disorders may be coded separately when they are independently documented and meet diagnostic criteria. Some of those diagnoses do carry HCC weight.

MS-DRG v44 (FY2027)

MS-DRG 882: Neuroses Except Depressive, under MDC 19, Mental Diseases and Disorders.

DRG 882 is a single-tier assignment with no MCC or CC sub-classification in the neuroses grouping.

When adjustment disorder is reported as a principal inpatient diagnosis, the record must support the inpatient level of care, for example suicidal ideation or acute functional incapacitation.

The assignment follows the CMS MS-DRG v44.0 Definitions Manual, Appendix B.

Medicare and commercial payers

Under Medicare, F43.20 supports medical necessity for individual and group psychotherapy (CPT 90832 to 90838 and 90853), psychiatric evaluation (90791 and 90792), and medication management when psychotropic medication is prescribed.

Mental health parity rules under MHPAEA require commercial payers to apply criteria to mental health benefits that are no more restrictive than those applied to comparable medical and surgical benefits.

WHERE SPECIFICITY IS LOST

F43.20 records that an adjustment disorder exists without recording which symptom pattern drives it. That detail is what distinguishes the encounter clinically and what supports the treatment plan on review.

Where the note describes a pattern but does not name it, query the provider for the subtype before assigning the unspecified code.

Documentation checklist to support F43.20

Chart elements that support code selection and reduce specificity-driven denials.

An explicit diagnosis of adjustment disorder in the provider's own words, not a description such as stress reaction or difficulty coping.

The identifiable psychosocial stressor that precipitated the reaction, such as an illness diagnosis, job loss, bereavement or relationship stress.

The temporal relationship: emotional or behavioral symptoms beginning within 3 months of the onset of the stressor.

Evidence of clinically significant distress or functional impairment beyond a normal response to the stressor.

A statement that the symptoms do not meet criteria for another mental disorder.

The absence of any documented predominant subtype, because a documented depressed, anxious, conduct or other symptom type directs the encounter to F43.21 through F43.29.

For an inpatient encounter, the clinical severity that supports that level of care.

Any comorbid depressive or anxiety disorder the provider has independently diagnosed and that is reported under its own code.

FAQ

Is F43.20 a billable code?

Yes. F43.20 is a valid billable code for HIPAA-covered transactions in the FY2027 code set.

When should I use F43.20 instead of F43.21?

Use F43.21 when the provider documents depressed mood as the predominant symptom of the adjustment disorder. Use F43.20 when the diagnosis is recorded without any stated subtype. Query the provider when the clinical documentation describes a pattern but does not name it.

Does F43.20 map to an HCC under CMS-HCC v28?

No. F43.20 maps to no HCC category under CMS-HCC v28, and it mapped to none under v24 either. It makes no RAF contribution. A comorbid depressive or anxiety disorder that is independently documented is coded separately, and some of those diagnoses do carry HCC weight.

Does F43.20 require a Use Additional or Code First code?

No. F43.20 carries no mandatory tabular-level Use Additional or Code First instruction. Z codes for the precipitating psychosocial circumstances, such as Z63.0 or a code from Z65, may be reported alongside it when documented, under Guideline I.C.21.c.17.

Can F43.20 and F93.0 be reported together?

Yes. F43.20 and F93.0 can be reported together when each condition is independently diagnosed and documented. The parent F43.2 subcategory carries an Excludes2 note for F93.0, separation anxiety disorder of childhood. An Excludes2 note means the two conditions are distinct but may coexist, and it does not prohibit dual coding.

How is adjustment disorder distinguished from major depressive disorder?

Adjustment disorder with depressed mood (F43.21) is a distinct diagnosis from major depressive disorder (the F32 and F33 codes). DSM-5 criteria differentiate the two conditions. The distinction is a clinical judgment for the provider. Assign the code that matches the diagnosis documented rather than one inferred from the symptom description.

Can F43.20 be coded alongside a physical illness code?

Yes. Adjustment disorder co-occurs with serious medical illness, including a new cancer diagnosis, a new chronic disease and post-surgical adjustment. Code both the medical condition and F43.20 when the provider documents the adjustment disorder as a separate clinical diagnosis secondary to the medical illness.

Does F43.20 behave differently on the inpatient side?

As a principal inpatient diagnosis, F43.20 groups to MS-DRG 882 under MDC 19 in the FY2027 MS-DRG v44 grouper. The record must document the clinical severity that justifies inpatient psychiatric admission.

Related codes

Codes in the same family as F43.20. Only codes with a published page render as links.

Sibling codes in the F43.2 family

F43.21: Adjustment disorder with depressed mood.
F43.22: Adjustment disorder with anxiety.
F43.23: Adjustment disorder with mixed anxiety and depressed mood.
F43.24: Adjustment disorder with disturbance of conduct.
F43.25: Adjustment disorder with mixed disturbance of emotions and conduct.
F43.29: Adjustment disorder with other symptoms.

Additional codes to consider

Codes outside the F43.2 family considered alongside F43.20.

Companion: code alongside when documented

F93.0: Separation anxiety disorder of childhood, reportable with F43.20 under the Excludes2 note when independently diagnosed.
Z63.0: Problems in relationship with spouse or partner, when the stressor is documented, under Guideline I.C.21.c.17.
Z65-: Problems related to other psychosocial circumstances, under the same guideline.

Consider instead

F32-: Depressive episode, where the documented diagnosis is a depressive disorder rather than an adjustment disorder.
F33-: Major depressive disorder, recurrent, where the provider documents recurrent major depression.

Sources

All claims on this page derive from government and professional-standards sources.

National Center for Health Statistics. (2026). International classification of diseases, tenth revision, clinical modification (ICD-10-CM) FY2027 files. https://www.cdc.gov/nchs/icd/icd-10-cm/files.html
Centers for Medicare & Medicaid Services and National Center for Health Statistics. (2026). ICD-10-CM official guidelines for coding and reporting FY2027. https://ftp.cdc.gov/pub/Health_Statistics/NCHS/Publications/ICD10CM/2027/ICD-10-CM-October-1-2026-FY27-Guidelines.pdf
Centers for Medicare & Medicaid Services. (2025). 2026 model software/ICD-10 mappings. https://www.cms.gov/medicare/payment/medicare-advantage-rates-statistics/risk-adjustment/2026-model-software-icd-10-mappings
Centers for Medicare & Medicaid Services. (2026). MS-DRG classifications and software, version 44. https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps/ms-drg-classifications-and-software