F43.23: A Therapist's Reference for Adjustment Disorder with Mixed Anxiety and Depressed Mood

Adjustment disorder with mixed anxiety and depressed mood is one of the codes therapists reach for most often in outpatient practice. It captures the presentation many clients arrive with: a recent, identifiable life stressor followed by a mix of anxiety and low mood that disrupts daily functioning without meeting the threshold for major depressive disorder or generalized anxiety disorder. Most outpatient adult caseloads see this picture weekly, whether the work is private practice, community clinic, or EAP-based.

The frequency of use makes this code one that licensing boards and payer auditors look at carefully. When a chart leans on it as a default for any client in distress, the documentation usually does not hold up. When the chart establishes the stressor, the timing, and both symptom clusters required by the specifier, F43.23 becomes one of the more defensible diagnoses in outpatient therapy. What separates a defensible chart from a vulnerable one usually comes down to the intake note and the first three or four progress notes.

For licensed therapists, psychologists, counselors, and clinical social workers who diagnose and bill under ICD-10-CM, this page sits inside the ICD-10 codes for therapists sub-hub. It walks through the official descriptor, the diagnostic criteria, the adjacent F43.2x codes, the documentation an auditor expects to find, and the CPT codes commonly paired with the diagnosis.

Educational reference for licensed mental health practitioners. Coding and documentation requirements vary by state, payer, and setting; verify against your state licensing board, payer contracts, and the current ICD-10-CM official guidelines for the year of service.

What ICD-10-CM F43.23 actually means

ICD-10-CM defines F43.23 as “Adjustment disorder with mixed anxiety and depressed mood.” The code sits inside a structured family worth understanding before applying it to a client. The parent block F40-F48 covers anxiety, dissociative, stress-related, somatoform, and other nonpsychotic mental disorders. Inside that block, F43 is the category for “Reaction to severe stress, and adjustment disorders,” which groups acute stress reactions, post-traumatic stress disorder, and the F43.2x subtypes together because they share an identifiable precipitating stressor.

F43.2 narrows to “Adjustment disorders,” and the fifth-character specifier identifies the predominant symptom pattern. The specifiers are F43.20 (unspecified), F43.21 (with depressed mood), F43.22 (with anxiety), F43.23 (with mixed anxiety and depressed mood), F43.24 (with disturbance of conduct), F43.25 (with mixed disturbance of emotions and conduct), and F43.29 (with other symptoms). The .23 specifier requires that both anxiety symptoms and depressive symptoms are present and clinically significant; neither alone is enough to support it.

The official descriptor is published by the Centers for Medicare and Medicaid Services and mirrored at icd10data.com, with the broader CMS reference available at the CMS ICD-10 page. Use the descriptor wording as published; reviewers expect the specifier language to match the official text rather than a paraphrase.

Diagnostic criteria

The DSM-5 criteria for the F43.2x family are six lettered criteria, A through F, that together establish the diagnosis. Criterion A requires the development of emotional or behavioral symptoms in response to an identifiable stressor occurring within three months of the stressor’s onset. Criterion B requires that the symptoms or behaviors are clinically significant, evidenced either by marked distress out of proportion to the severity or intensity of the stressor (taking cultural context into account) or by significant impairment in social, occupational, or other important areas of functioning.

Criterion C requires that the disturbance does not meet the criteria for another mental disorder and is not merely an exacerbation of a preexisting one. Criterion D requires that the symptoms do not represent normal bereavement. Criterion E requires that, once the stressor or its consequences have terminated, the symptoms do not persist for more than an additional six months. Criterion F is the specifier subtype: “with mixed anxiety and depressed mood: a combination of depression and anxiety is predominant.”

The durational rule is what makes F43.23 distinct in chart review. Symptoms must begin within three months of stressor onset and resolve within six months of stressor termination, unless the stressor itself is enduring (for example, an ongoing illness or a prolonged unemployment), in which case the diagnosis may be extended and re-coded. The DSM-5 alignment is straightforward: DSM-5 “Adjustment Disorder, with mixed anxiety and depressed mood” maps directly to the ICD code, and the documentation should mirror DSM-5 criteria language even though billing uses the ICD descriptor.

A board-defensible chart shows the criteria addressed explicitly. The standard practice is to embed the criteria check inside the intake assessment alongside the mental status exam findings so the diagnostic reasoning is visible to a later reader.

F43.23 vs adjacent codes

The F43.2x family is built so that the fifth digit selects the symptom pattern. Choosing the right specifier is what separates a defensible chart from a sloppy one, because the specifier carries clinical meaning and signals which symptoms drove the diagnosis.

Code	Subtype	When to use
F43.20	Unspecified	Adjustment symptoms present but the pattern is mixed in a way that does not fit another specifier, or the predominant pattern is not yet clear at initial diagnosis. Use sparingly; reviewers expect resolution to a specifier within a few sessions.
F43.21	With depressed mood	Low mood, tearfulness, hopelessness predominate. Anxiety symptoms are absent or minimal.
F43.22	With anxiety	Nervousness, worry, jitteriness, separation-related anxiety predominate. Depressive symptoms are absent or minimal.
F43.23	With mixed anxiety and depressed mood	Both anxiety and depressive symptom clusters are clinically significant. Neither alone would justify the .21 or .22 specifier.
F43.24	With disturbance of conduct	The presentation is dominated by behavior that violates norms or rules (more common in adolescents).
F43.25	With mixed disturbance of emotions and conduct	Both emotional symptoms (anxiety, depression) and conduct disturbance are present.

Differential codes outside the F43 family also matter. F32.x (major depressive disorder, single episode) is the better choice when the depressive symptoms meet full MDD criteria regardless of an identifiable stressor; the presence of a stressor does not downgrade MDD to F43.23 if the symptom count, duration, and severity meet the MDD threshold. F41.1 (generalized anxiety disorder) is the better choice when worry is excessive across multiple domains and has persisted for at least six months, independent of a specific stressor. When the clinical picture meets criteria for both MDD and an anxiety disorder, the F43.2x family is not the right home.

Clinical use in therapy

In outpatient practice, the diagnosis commonly applies to clients presenting after a discrete life event: a job loss, the end of a long relationship, a recent medical diagnosis, a geographic move, the death of a more distant person that does not meet bereavement exclusions, a child leaving home, or a significant role change at work. The presentation is often clearer than MDD or GAD because the client can point to the stressor and date its onset.

Modality fit follows from the clinical picture. Cognitive behavioral therapy is well matched here because it gives structure for examining the cognitive distortions that often emerge around the stressor (catastrophizing about a job loss, overgeneralizing about a relationship ending). Acceptance and commitment therapy fits clients whose distress centers on values disruption and meaning-making after the stressor. Brief, time-limited therapy aligns with the durational expectation built into the diagnosis: if the stressor has resolved or is resolving, the treatment plan can reasonably target symptom reduction over twelve to sixteen sessions rather than open-ended care.

Treatment planning should reference the durational expectation explicitly. A plan that targets symptom resolution within the six-month post-stressor window, with re-evaluation if symptoms persist, signals to a later reviewer that the clinician understands the diagnosis. If symptoms persist beyond six months after stressor resolution, the diagnosis should be reconsidered; the chart should reflect that clinical decision rather than carrying the same code indefinitely.

Documentation that holds up under audit

A defensible chart establishes five elements at intake and revisits them as clinically indicated. First, the stressor is named and dated specifically. “Recent stressor” is not enough; the chart should identify what the stressor is (job termination on a specific date, separation initiated by partner in a specific month) and note that symptom onset followed within three months. Second, both symptom clusters required by the specifier are documented. Anxiety symptoms (worry, restlessness, sleep onset insomnia, somatic tension) and depressive symptoms (low mood, anhedonia, hopelessness, fatigue) should appear in the assessment with concrete client report or observation supporting each.

Third, the chart shows that MDD and GAD have been considered and ruled out. A brief note that the client does not meet MDD criteria (does not endorse the required symptom count, duration, or severity) and does not meet GAD criteria (worry is tied to the identified stressor rather than excessive across multiple unrelated domains for at least six months) closes off the most common audit objection. Fourth, functional impairment is described concretely: missed work days, withdrawal from previously valued activities, disrupted sleep, decreased productivity. Generic language (“functioning impaired”) is weaker than specific, observable impacts. Fifth, the treatment plan is tied to the stressor and the durational expectation, with a planned re-evaluation point.

The American Psychological Association’s record-keeping guidance and the HIPAA provisions at 45 CFR § 164.501 distinguish between psychotherapy notes, which are kept separate and receive heightened protection, and the progress notes that go into the medical record. Diagnostic justification belongs in the progress note and the treatment plan, not in psychotherapy notes, because the progress note is what supports the billed diagnosis under audit. For broader documentation patterns, the clinical documentation reference covers the structure of progress notes that consistently survive review.

CPT codes commonly paired with F43.23

The diagnostic code identifies the condition; the procedure code identifies the service rendered. The CPT codes most commonly paired with F43.23 are 90791 for the diagnostic evaluation at intake (no medical services), 90832 for psychotherapy of approximately 30 minutes, 90834 for approximately 45 minutes (the most common routine psychotherapy code in outpatient practice), and 90837 for approximately 60 minutes. Add-on code 90785 for interactive complexity may apply when communication factors complicate the session.

The diagnostic and procedure codes travel together on the claim line. F43.23 should appear as the primary diagnosis pointer on each psychotherapy CPT line during the active treatment episode. For the intake encounter, the 99204 new patient evaluation reference covers the medical evaluation and management code that some prescriber-clinician practices pair with the same diagnosis. Time-based codes require time documentation in the note that supports the code billed; payers routinely deny 90837 when the note does not establish that the session ran to the time threshold.

How Emosapien suggests F43.23 during the session

Emosapien’s Scribe Agent listens to the intake and ongoing sessions as an active co-therapist. When the conversation establishes a recent identifiable stressor, both anxiety-cluster and depressive-cluster symptoms, and timing within the three-month window, the agent surfaces this code as a diagnostic candidate alongside the criteria checklist. The clinician reviews the suggestion, accepts or revises it, and the Assessment section of the progress note populates with the specifier-defining language and references to the moments in session where each criterion was supported.

This is not coding automation. The clinician makes the diagnosis. The agent surfaces the candidate, shows its work against the DSM-5 criteria and the ICD-10-CM descriptor, and produces an Assessment that is ready for chart review without retyping. See the AI clinical notes overview for how the Scribe Agent handles documentation across the rest of the note, or start a trial to see candidate diagnostic suggestions in your own intake workflow.