Billable / Specific Code
ICD-10-CM F43.21 is the diagnosis code for Adjustment disorder with depressed mood. This code falls under the section "Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders" within Chapter 5 — Mental, Behavioral and Neurodevelopmental disorders (F01-F99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where F43.21 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, F43.21 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
F43.21 is the ICD-10-CM diagnosis code for "Adjustment disorder with depressed mood". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of F43.21 is F43.2 ("Adjustment disorders"). F43.21 provides a more specific classification within this category.
F43.21 is located in Section F40-F48 — "Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders" within Chapter 5 of the ICD-10-CM Tabular List.
Use F43.21 when the patients documented diagnosis matches "Adjustment disorder with depressed mood" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Adjustment disorder with depressed mood is F43.21.
Yes, F43.21 can be used as a primary diagnosis code since it is billable and specific.
F43.21 is in Chapter 5 of the ICD-10-CM Tabular List.
Yes, F43.21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.