F45.21 Hypochondriasis

Billable ICD-10-CM code, FY2026.

Applicable to

• Hypochondriacal neurosis
• Illness anxiety disorder

Applies from F45 Somatoform disorders

Excludes2 (not included here)

• dissociative and conversion disorders (F44.-)
• factitious disorders (F68.1-, F68.A)
• hair-plucking (F63.3)
• lalling (F80.0)
• lisping (F80.0)
• malingering [conscious simulation] (Z76.5)
• nail-biting (F98.8)
• psychological or behavioral factors associated with disorders or diseases classified elsewhere (F54)
• sexual dysfunction, not due to a substance or known physiological condition (F52.-)
• thumb-sucking (F98.8)
• tic disorders (in childhood and adolescence) (F95.-)
• Tourette's syndrome (F95.2)
• trichotillomania (F63.3)

Applies from F45.2 Hypochondriacal disorders

Excludes2 (not included here)

• delusional dysmorphophobia (F22)
• fixed delusions about bodily functions or shape (F22)

Risk adjustment (HCC)

• RxHCC V08: HCC 133 — Anxiety and Other Psychiatric Disorders

MS-DRG index

Defines the logic of DRG(s) 882 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 300.7 Hypochondriasis (approximate)

Code annotations containing back-references to F45.21

Back-references to F45

• Type 2 Excludes: F41 Other anxiety disorders ("psychophysiologic disorders (F45.-)")
• Type 2 Excludes: F93.0 Separation anxiety disorder of childhood ("nonpsychotic mental disorders (F40-F48)")

Diagnosis Index entries for F45.21

• Disorder (of) › anxiety › illness
• Disorder (of) › hypochondriacal › neurosis
• Disorder (of) › identity › illness anxiety
• Hypochondria, hypochondriac, hypochondriasis (reaction)
• Neurosis, neurotic › hypochondriacal
• Nosomania
• Psychoneurosis, psychoneurotic › hypochondriacal

Nearby codes

• F45 Somatoform disorders
• F45.0 Somatization disorder
• F45.1 Undifferentiated somatoform disorder
• F45.2 Hypochondriacal disorders
• F45.20 Hypochondriacal disorder, unspecified
• F45.21 Hypochondriasis (this code)
• F45.22 Body dysmorphic disorder
• F45.29 Other hypochondriacal disorders
• F45.4 Pain disorders related to psychological factors
• F45.41 Pain disorder exclusively related to psychological factors
• F45.42 Pain disorder with related psychological factors