ICD-10-CM 2027
ICD-10 code for acute sinusitis
From the official ICD-10-CM alphabetic index entry “Sinusitis (accessory) (chronic) (hyperplastic) (nasal) (nonpurulent) (purulent) › acute”. Page updated September 29, 2026.
About coding acute sinusitis
The ICD-10-CM code for acute sinusitis is J01.90 (Acute sinusitis, unspecified). The official index lists 15 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J01.90.
Within J01.9, choose J01.90 (sinusitis, unspecified) only when documentation doesn't support a more specific option: recurrent sinusitis, unspecified (J01.91).
Use an additional code (B95-B97) to identify infectious agent.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific acute sinusitis codes (official index)
- ethmoidal J01.20 — Acute ethmoidal sinusitis, unspecified
- recurrent J01.21 — Acute recurrent ethmoidal sinusitis
- frontal J01.10 — Acute frontal sinusitis, unspecified
- recurrent J01.11 — Acute recurrent frontal sinusitis
- involving more than one sinus, other than pansinusitis J01.80 — Other acute sinusitis
- recurrent J01.81 — Other acute recurrent sinusitis
- maxillary J01.00 — Acute maxillary sinusitis, unspecified
- recurrent J01.01 — Acute recurrent maxillary sinusitis
- pansinusitis J01.40 — Acute pansinusitis, unspecified
- recurrent J01.41 — Acute recurrent pansinusitis
- recurrent J01.91 — Acute recurrent sinusitis, unspecified
- specified NEC J01.80 — Other acute sinusitis
- recurrent J01.81 — Other acute recurrent sinusitis
- sphenoidal J01.30 — Acute sphenoidal sinusitis, unspecified
- recurrent J01.31 — Acute recurrent sphenoidal sinusitis
Common questions about acute sinusitis ICD-10 codes
What is the ICD-10 code for acute sinusitis?
- J01.90 — Acute sinusitis, unspecified. More specific codes apply when the documentation supports them: J01.20, J01.21, J01.10, J01.11 and others below.
What is the ICD-10 code for ethmoidal acute sinusitis?
- J01.20 — Acute ethmoidal sinusitis, unspecified.
What is the ICD-10 code for frontal acute sinusitis?
- J01.10 — Acute frontal sinusitis, unspecified.
What is the ICD-10 code for maxillary acute sinusitis?
- J01.00 — Acute maxillary sinusitis, unspecified.
What is the ICD-10 code for pansinusitis acute sinusitis?
- J01.40 — Acute pansinusitis, unspecified.
What is the ICD-10 code for recurrent acute sinusitis?
- J01.91 — Acute recurrent sinusitis, unspecified.
What is the ICD-10 code for sphenoidal acute sinusitis?
- J01.30 — Acute sphenoidal sinusitis, unspecified.
Is J01.90 billable?
- Yes. J01.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J01.90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J01.90 as a principal diagnosis.
Is J01.90 a CC or MCC?
- No. J01.90 is neither a CC nor an MCC under MS-DRG v44.0.