F45.21 ICD-10-CM Code: Hypochondriasis
F45.21 is the billable ICD-10-CM code for “Hypochondriasis” in the FY 2027 U.S. code set, effective Oct 1, 2026.
Official description
F45.21Hypochondriasis
ICD-10-CM diagnosis code · United States clinical modification
Where F45.21 sits
- 1
Chapter 5
Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
- 2
Section
Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48)
- 3
Category F45
Somatoform disorders
- 4
Subcategory F45.2
Hypochondriacal disorders
- 5
Code F45.21
Hypochondriasis
Notes for this code
Inclusion terms
- Hypochondriacal neurosis
- Illness anxiety disorder
Code first
No “code first” instruction is listed for F45.21.
Use additional code
No “use additional code” instruction is listed for F45.21.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for F45.21.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for F45.21.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code F45.21 mean?
F45.21 is the FY 2027 U.S. ICD-10-CM code for “Hypochondriasis.”
Is F45.21 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, F45.21 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is F45.21 located in ICD-10-CM?
F45.21 is listed in Chapter 5, Mental, Behavioral and Neurodevelopmental disorders (F01-F99), within Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48) (F40–F48), under category F45, Somatoform disorders and subcategory F45.2, Hypochondriacal disorders.
What coding notes are listed for F45.21?
Its listed inclusion terms are Hypochondriacal neurosis; Illness anxiety disorder. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.