ICD-10-CM 2027
ICD-10 code for Irreversible pulpitis
From the official ICD-10-CM alphabetic index entry “Pulpitis (acute) (anachoretic) (chronic) (hyperplastic) (putrescent) (suppurative) (ulcerative) › irreversible”. Page updated September 29, 2026.
About coding Irreversible pulpitis
The ICD-10-CM code for Irreversible pulpitis is K04.02 (Irreversible pulpitis).
Within K04.0 (pulpitis), K04.02 is specifically for Irreversible pulpitis. Related codes cover reversible pulpitis (K04.01).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC, relative weight 5.6154), DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC, relative weight 4.381), DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC, relative weight 2.7307), DRG 157 (Dental and Oral Diseases with MCC, relative weight 1.809), DRG 158 (Dental and Oral Diseases with CC, relative weight 0.9366) and DRG 159 (Dental and Oral Diseases without CC/MCC, relative weight 0.6893), in Pre-MDC and MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Irreversible pulpitis ICD-10 codes
What is the ICD-10 code for Irreversible pulpitis?
- K04.02 — Irreversible pulpitis.
Is K04.02 billable?
- Yes. K04.02 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K04.02 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K04.02 as a principal diagnosis.
Is K04.02 a CC or MCC?
- K04.02 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.