ICD-10-CM 2027
ICD-10 code for autoantibodies
From the official ICD-10-CM alphabetic index entry “Autoantibodies, multiple confirmed islet, with normoglycemia”. Page updated September 29, 2026.
About coding autoantibodies
The ICD-10-CM code for autoantibodies is E10.A1 (Type 1 diabetes mellitus, presymptomatic, Stage 1).
Within E10.A (type 1 diabetes mellitus, presymptomatic), E10.A1 is specifically for type 1 diabetes mellitus, presymptomatic, Stage 1. Related codes cover unspecified (E10.A0) and stage 2 (E10.A2).
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 008 (Simultaneous Pancreas, Islet Cell and Kidney Transplant, relative weight 5.5146), DRG 010 (Pancreas or Islet Cell Transplant, relative weight 7.5259), DRG 019 (Simultaneous Pancreas, Islet Cell and Kidney Transplant with Hemodialysis, relative weight 7.5493), DRG 637 (Diabetes with MCC, relative weight 1.4129), DRG 638 (Diabetes with CC, relative weight 0.9019) and DRG 639 (Diabetes without CC/MCC, relative weight 0.6376), in Pre-MDC and MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), 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 autoantibodies ICD-10 codes
What is the ICD-10 code for autoantibodies?
- E10.A1 — Type 1 diabetes mellitus, presymptomatic, Stage 1.
Is E10.A1 billable?
- Yes. E10.A1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E10.A1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E10.A1 as a principal diagnosis.
Is E10.A1 a CC or MCC?
- No. E10.A1 is neither a CC nor an MCC under MS-DRG v44.0.