ICD-10-CM 2027
ICD-10 code for appendix lymphoid hyperplasia
From the official ICD-10-CM alphabetic index entry “Hyperplasia, hyperplastic › appendix (lymphoid)”. Page updated September 29, 2026.
About coding appendix lymphoid hyperplasia
The ICD-10-CM code for appendix lymphoid hyperplasia is K38.0 (Hyperplasia of appendix).
Within K38 (other diseases of appendix), K38.0 is specifically for hyperplasia of appendix. Related codes cover Appendicular concretions (K38.1), diverticulum of appendix (K38.2), fistula of appendix (K38.3), other specified diseases of appendix (K38.8) and disease of appendix, unspecified (K38.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), 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 appendix lymphoid hyperplasia ICD-10 codes
What is the ICD-10 code for appendix lymphoid hyperplasia?
- K38.0 — Hyperplasia of appendix.
Is K38.0 billable?
- Yes. K38.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K38.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K38.0 as a principal diagnosis.
Is K38.0 a CC or MCC?
- No. K38.0 is neither a CC nor an MCC under MS-DRG v44.0.