Adjustment Disorder ICD-10 Code: F43.20 to F43.25 Guide

By Awais Afzal, Healthcare Operations & Data Analyst · Published February 24, 2026 · Updated October 14, 2026

The adjustment disorder ICD-10 code is one of the F43.2 codes: F43.21 (depressed mood), F43.22 (anxiety), F43.23 (mixed anxiety and depressed mood), F43.24 (conduct), F43.25 (mixed emotions and conduct) or F43.20 (unspecified). Pick the one that matches the clinician's diagnosis and the symptoms documented in the note.

The DSM-5-TR sets the clinical criteria for adjustment disorder. The claim, though, carries an ICD-10-CM code. This guide connects the two so the diagnosis on the claim matches the story in the chart. It is written for clinicians, practice managers and billers. Treat it as an operations guide, not a coding or clinical ruling. For the wider picture, see our guides to coding and billing for mental health services and the behavioral health coding cheat sheet.

The DSM does not bill. ICD-10-CM does

The DSM-5-TR describes the condition; the claim reports an ICD-10-CM code. Payers read the diagnosis code on the claim, not the manual. The American Psychiatric Association publishes the DSM-5-TR with a listing of diagnoses and the matching ICD-10-CM codes, and it issues coding updates as the code set changes (APA DSM-5-TR update supplement). So the two work together: the DSM supports the clinical decision, and the ICD-10-CM code is what gets reported.

The code set updates every year. CMS notes that the October 1, 2026 diagnosis code update files are available and apply to discharges from October 1, 2026 through September 30, 2027, labelled FY 2027 (CMS ICD-10 codes page). Ask your EHR vendor or billing team to confirm the F43.2x entries in your system match the current year.

One rule from the official guidelines matters for this topic. Code assignment rests on the provider’s diagnostic statement that the condition exists, and it does not depend on which clinical criteria the provider used to reach it. If the record conflicts, the provider should be queried (FY 2027 ICD-10-CM Official Guidelines, Section I.A.19). In practice, the diagnosis in the note, the code on the claim and the treatment plan must all say the same thing.

For the practice side of this, our behavioral and mental health billing page explains how diagnosis coding fits the rest of the revenue cycle.

Check the criteria before you pick a code

Adjustment disorder is a response to an identifiable stressor, and the timing matters. Three points come up in almost every coding question.

• Onset. Symptoms follow the stressor, usually within three months. The Defense Health Agency adjustment disorder reference states symptoms must occur within three months of the stressor (Defense Health Agency); MedlinePlus says the same in general terms (MedlinePlus).
• Duration. Symptoms usually do not last longer than six months unless the stressor continues (MedlinePlus). The exact DSM-5-TR wording is the authority for the diagnosis, so clinicians should work from the manual itself.
• Exclusions. The condition should not be explained by another mental disorder or by normal grief. PTSD (F43.1) and acute stress reaction (F43.0) are separate diagnoses with their own codes (Defense Health Agency reference).

Source: Defense Health Agency (adjustment disorders reference) and MedlinePlus; RCM Finder operations checklist.

The F43.2x codes and when each one fits

There are six codes in the usual DSM-5-TR subtype set, and ICD-10-CM lists a seventh. The code descriptions below come from the Defense Health Agency reference (source). The APA has also revised the DSM-5-TR subtype definitions, including a definition of “disturbance of conduct” (APA update supplement), so check the current manual wording.

Source: Defense Health Agency, Adjustment Disorders reference (2022); APA DSM-5-TR update supplement (2025). Confirm against the FY 2027 ICD-10-CM tabular list.

F43.21: depressed mood

Use it when the documented picture is situational low mood tied to the stressor. If the provider diagnoses a major depressive episode instead, the adjustment disorder code does not apply to that episode. That is the provider’s call, and the note should explain it.

F43.22 and F43.23: anxiety, and anxiety with depressed mood

Anxiety predominant: F43.22. Both anxiety and low mood documented: F43.23. Pick the one the note supports, and do not report F43.21 and F43.22 together to cover the same episode. If you also work with standalone anxiety diagnoses, our anxiety ICD-10 codes guide explains how those differ.

F43.24 and F43.25: conduct, and mixed emotions and conduct

These need conduct problems in the record. A claim with F43.24 and a note that only describes tearfulness is a mismatch a reviewer can spot in seconds. Use F43.25 when the note shows both emotional symptoms and conduct problems.

F43.20: when unspecified is the honest code

The official guidelines say unspecified codes should be reported when they are the codes that most accurately reflect what is known (FY 2027 Guidelines, Section I.B.18). So F43.20 is not wrong. But when the note describes a clear symptom pattern, a specific subtype gives a reviewer more to match, and the provider should be asked whether a subtype applies.

Old numeric codes and outdated code sets in your EHR

ICD-10-CM codes begin with a letter. A numeric code from an old manual is not an ICD-10-CM code. If a template, superbill or EHR pick-list still shows older numeric diagnosis codes for adjustment disorder, ask the vendor or your billing team to update it. Do not translate old numbers by memory. Use the current code set and the provider’s documented diagnosis.

Superbills and saved diagnosis favorites are a common place for stale entries to survive. Review them whenever the annual update lands, and again when a new clinician joins and brings their own templates.

Why adjustment disorder claims get denied or questioned

Most problems come from a gap between the note and the code, not from the code itself. A denial or a records request usually points to one of the issues in Table 3.

Source: RCM Finder operations checklist, built on the ICD-10-CM Official Guidelines (FY 2027).

When a claim does come back, a structured appeal process helps. See our guide to CO-16 denials for missing information and our broader overview of medical billing denial management.

When the episode runs long

A diagnosis that was right at intake may need to change later. If symptoms continue well past the expected window and the stressor has ended, the provider should reconsider the diagnosis rather than keep carrying the same code forward. Another disorder may now explain the picture.

The reverse also holds. MedlinePlus notes that the problem usually resolves within six months unless the stressor continues (MedlinePlus), so an ongoing stressor, such as a long family illness, can explain a longer episode. The note should say the stressor is still active.

Grief is a related edge case. The Defense Health Agency reference says the symptoms should not be part of normal grieving. Whether a presentation is normal grief, prolonged grief or an adjustment disorder is a clinical judgment, and the note should record the reasoning. Reviews of these claims fall under the same documentation habits covered in our guide to medical coding audits.

Session counts and visit limits are payer-specific. Check each plan’s behavioral health policy and authorization rules rather than assuming a number.

A short workflow for practices

The simplest control is a pre-bill check that compares the code to the note. The steps below add little time and catch most mismatches before submission. They sit alongside your wider process for mental health billing and your behavioral health revenue cycle.

1. The provider documents the stressor, symptoms and diagnosis in the note.
2. Billing confirms the F43.2x code matches the documented subtype.
3. A second look happens whenever the code is F43.20, F43.24 or F43.25.
4. Episodes that continue are flagged for provider re-assessment.
5. Denials are tracked by diagnosis code so repeat problems show up.

If your practice sees many behavioral health patients, medical billing services that include coding support can take the code-to-note check off the clinician’s plate. You can also estimate what unpaid claims cost with our revenue calculator.

Our recommendations

1. Name the stressor in every note. We recommend a required field for the stressor in the adjustment disorder note template.
2. Report one subtype per episode. Choose the single F43.2x code that fits the documented symptoms and avoid stacking.
3. Review F43.20 use. Audit how often unspecified is used and ask providers whether a subtype is supported.
4. Re-assess long episodes. Set a prompt for the provider to revisit the diagnosis if the episode runs on after the stressor ends.
5. Update code sets each October. Ask the EHR vendor to confirm diagnosis lists after the annual ICD-10-CM release.
6. Check payer policy. Look up each plan’s behavioral health authorization rules rather than assuming visit limits.

Bottom line

Choosing the adjustment disorder ICD-10 code is a documentation task more than a lookup task: name the stressor, match the subtype to the symptoms, and keep the note and claim in agreement. If denials keep coming back on behavioral health claims, our denial management services and behavioral health billing support can help find the pattern. Start with a free practice audit.

Frequently asked questions

What is the ICD-10 code for adjustment disorder?

Adjustment disorder is coded in the F43.2 range: F43.20 unspecified, F43.21 depressed mood, F43.22 anxiety, F43.23 mixed anxiety and depressed mood, F43.24 disturbance of conduct and F43.25 mixed disturbance of emotions and conduct. ICD-10-CM also lists F43.29 for other symptoms. The provider’s documented diagnosis decides which applies, so billing staff should match the code to the note and never choose a subtype on the clinician’s behalf.

Does the DSM have billing codes?

The DSM-5-TR lists ICD-10-CM codes beside its diagnoses, so it points you to the code. But the claim reports the ICD-10-CM code, and those codes update each October 1. Always confirm the current year’s code set in your EHR or the official CMS files rather than relying on a printed manual, and ask the provider if the note and the listed diagnosis do not line up.

Can I bill F43.21 and F43.22 together?

For the same episode, choose the single subtype that fits. If both anxiety and depressed mood are documented, F43.23 describes that combination. Stacking separate subtype codes can look like a mismatch to a reviewer, and the note should support whichever single code you choose.

Is F43.20 acceptable to use?

Yes, when it reflects what is known. The ICD-10-CM guidelines say unspecified codes should be reported when they most accurately reflect the documentation. If the note shows a clear pattern, ask the provider whether a specific subtype applies.

Can adjustment disorder be used for grief?

Normal grief is not a mental disorder, and the Defense Health Agency reference says symptoms should not be part of normal grieving. Whether a presentation is grief, prolonged grief or adjustment disorder is a clinical decision. The provider should document the reasoning.

What if the stressor is ongoing?

Symptoms usually do not last longer than six months unless the stressor continues, per MedlinePlus. If the stressor is still active, the note should say so, and the provider should re-assess the diagnosis at appropriate intervals.

Sources

1. Adjustment Disorders — Defense Health Agency (health.mil) (2022)
2. Adjustment disorder — MedlinePlus (NIH) (2026)
3. ICD-10 Codes — CMS (2026)
4. FY 2027 ICD-10-CM Official Guidelines for Coding and Reporting — CMS / NCHS (2026)
5. DSM-5-TR Update Supplement (September 2025) — American Psychiatric Association (2025)