J01.10 Acute frontal sinusitis, unspecified

Billable ICD-10-CM code, FY2026.

Applies from J01 Acute sinusitis

Includes

• acute abscess of sinus
• acute empyema of sinus
• acute infection of sinus
• acute inflammation of sinus
• acute suppuration of sinus

Excludes1 (never code together)

• sinusitis NOS (J32.9)

Excludes2 (not included here)

• chronic sinusitis (J32.0-J32.8)

Use additional code

• code (B95-B97) to identify infectious agent.

MS-DRG index

Defines the logic of DRG(s) 152-153 in MDC 03.

Approximate ICD-9-CM (GEMs)

• 461.1 Acute frontal sinusitis (approximate)

Code annotations containing back-references to J01.10

Back-references to J01

• Code Also: D81.82 Activated Phosphoinositide 3-kinase Delta Syndrome [APDS] ("other acute respiratory tract infections (J00-J06; J20-J22)")
• Use Additional: J09.X2 Influenza due to identified novel influenza A virus with other respiratory manifestations ("sinusitis (J01.-)")
• Use Additional: J10.1 Influenza due to other identified influenza virus with other respiratory manifestations ("code for associated sinusitis, if applicable (J01.-)")
• Use Additional: J11.1 Influenza due to unidentified influenza virus with other respiratory manifestations ("code for associated sinusitis, if applicable (J01.-)")
• Type 2 Excludes: J32 Chronic sinusitis ("acute sinusitis (J01.-)")

Diagnosis Index entries for J01.10

• Sinusitis (accessory) (chronic) (hyperplastic) (nasal) (nonpurulent) (purulent) › acute › frontal
• Sinusitis (accessory) (chronic) (hyperplastic) (nasal) (nonpurulent) (purulent) › frontal › acute

Nearby codes

• J01 Acute sinusitis
• J01.0 Acute maxillary sinusitis
• J01.00 Acute maxillary sinusitis, unspecified
• J01.01 Acute recurrent maxillary sinusitis
• J01.1 Acute frontal sinusitis
• J01.10 Acute frontal sinusitis, unspecified (this code)
• J01.11 Acute recurrent frontal sinusitis
• J01.2 Acute ethmoidal sinusitis
• J01.20 Acute ethmoidal sinusitis, unspecified
• J01.21 Acute recurrent ethmoidal sinusitis
• J01.3 Acute sphenoidal sinusitis