ICD-10-CM 2027
ICD-10 code for type 1 diabetes
Confirmed by the official ICD-10-CM index entry “diabetes, diabetic (mellitus) (sugar) › type 1”. Page updated September 29, 2026.
About coding type 1 diabetes
The ICD-10-CM code for type 1 diabetes is E10.9 (Type 1 diabetes mellitus without complications). The official index lists 86 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on E10.9.
It is also searched as T1DM, diabetes type 1.
Within E10, choose E10.9 (without complications) only when documentation doesn't support a more specific option: with ketoacidosis (E10.1), with kidney complications (E10.2), with ophthalmic complications (E10.3), with neurological complications (E10.4), with circulatory complications (E10.5), with other specified complications (E10.6), with unspecified complications (E10.8) and presymptomatic (E10.A).
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 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 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.
Related Type 1 diabetes codes
- E10.10 Type 1 diabetes mellitus with ketoacidosis without coma
- E10.11 Type 1 diabetes mellitus with ketoacidosis with coma
- E10.21 Type 1 diabetes mellitus with diabetic nephropathy
- E10.22 Type 1 diabetes mellitus with diabetic chronic kidney disease
- E10.29 Type 1 diabetes mellitus with other diabetic kidney complication
- E10.311 Type 1 diabetes mellitus with unspecified diabetic retinopathy with macular edema
- E10.319 Type 1 diabetes mellitus with unspecified diabetic retinopathy without macular edema
- E10.3211 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema, right eye
- E10.3212 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema, left eye
- E10.3213 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema, bilateral
- E10.3219 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema, unspecified eye
- E10.3291 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy without macular edema, right eye
- E10.3292 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy without macular edema, left eye
- E10.3293 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy without macular edema, bilateral
- E10.3299 Type 1 diabetes mellitus with mild nonproliferative diabetic retinopathy without macular edema, unspecified eye
- E10.3311 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy with macular edema, right eye
- E10.3312 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy with macular edema, left eye
- E10.3313 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy with macular edema, bilateral
- E10.3319 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy with macular edema, unspecified eye
- E10.3391 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy without macular edema, right eye
- E10.3392 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy without macular edema, left eye
- E10.3393 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy without macular edema, bilateral
- E10.3399 Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy without macular edema, unspecified eye
- E10.3411 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy with macular edema, right eye
- E10.3412 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy with macular edema, left eye
- E10.3413 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy with macular edema, bilateral
- E10.3419 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy with macular edema, unspecified eye
- E10.3491 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema, right eye
- E10.3492 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema, left eye
- E10.3493 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema, bilateral
- E10.3499 Type 1 diabetes mellitus with severe nonproliferative diabetic retinopathy without macular edema, unspecified eye
- E10.3511 Type 1 diabetes mellitus with proliferative diabetic retinopathy with macular edema, right eye
- E10.3512 Type 1 diabetes mellitus with proliferative diabetic retinopathy with macular edema, left eye
- E10.3513 Type 1 diabetes mellitus with proliferative diabetic retinopathy with macular edema, bilateral
- E10.3519 Type 1 diabetes mellitus with proliferative diabetic retinopathy with macular edema, unspecified eye
- E10.3521 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment involving the macula, right eye
- E10.3522 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment involving the macula, left eye
- E10.3523 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment involving the macula, bilateral
- E10.3529 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment involving the macula, unspecified eye
- E10.3531 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment not involving the macula, right eye
- E10.3532 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment not involving the macula, left eye
- E10.3533 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment not involving the macula, bilateral
- E10.3539 Type 1 diabetes mellitus with proliferative diabetic retinopathy with traction retinal detachment not involving the macula, unspecified eye
- E10.3541 Type 1 diabetes mellitus with proliferative diabetic retinopathy with combined traction retinal detachment and rhegmatogenous retinal detachment, right eye
- E10.3542 Type 1 diabetes mellitus with proliferative diabetic retinopathy with combined traction retinal detachment and rhegmatogenous retinal detachment, left eye
- E10.3543 Type 1 diabetes mellitus with proliferative diabetic retinopathy with combined traction retinal detachment and rhegmatogenous retinal detachment, bilateral
- E10.3549 Type 1 diabetes mellitus with proliferative diabetic retinopathy with combined traction retinal detachment and rhegmatogenous retinal detachment, unspecified eye
- E10.3551 Type 1 diabetes mellitus with stable proliferative diabetic retinopathy, right eye
- E10.3552 Type 1 diabetes mellitus with stable proliferative diabetic retinopathy, left eye
- E10.3553 Type 1 diabetes mellitus with stable proliferative diabetic retinopathy, bilateral
- E10.3559 Type 1 diabetes mellitus with stable proliferative diabetic retinopathy, unspecified eye
- E10.3591 Type 1 diabetes mellitus with proliferative diabetic retinopathy without macular edema, right eye
- E10.3592 Type 1 diabetes mellitus with proliferative diabetic retinopathy without macular edema, left eye
- E10.3593 Type 1 diabetes mellitus with proliferative diabetic retinopathy without macular edema, bilateral
- E10.3599 Type 1 diabetes mellitus with proliferative diabetic retinopathy without macular edema, unspecified eye
- E10.36 Type 1 diabetes mellitus with diabetic cataract
- E10.37X1 Type 1 diabetes mellitus with diabetic macular edema, resolved following treatment, right eye
- E10.37X2 Type 1 diabetes mellitus with diabetic macular edema, resolved following treatment, left eye
- E10.37X3 Type 1 diabetes mellitus with diabetic macular edema, resolved following treatment, bilateral
- E10.37X9 Type 1 diabetes mellitus with diabetic macular edema, resolved following treatment, unspecified eye
- E10.39 Type 1 diabetes mellitus with other diabetic ophthalmic complication
- E10.40 Type 1 diabetes mellitus with diabetic neuropathy, unspecified
- E10.41 Type 1 diabetes mellitus with diabetic mononeuropathy
- E10.42 Type 1 diabetes mellitus with diabetic polyneuropathy
- E10.43 Type 1 diabetes mellitus with diabetic autonomic (poly)neuropathy
- E10.44 Type 1 diabetes mellitus with diabetic amyotrophy
- E10.49 Type 1 diabetes mellitus with other diabetic neurological complication
- E10.51 Type 1 diabetes mellitus with diabetic peripheral angiopathy without gangrene
- E10.52 Type 1 diabetes mellitus with diabetic peripheral angiopathy with gangrene
- E10.59 Type 1 diabetes mellitus with other circulatory complications
- E10.610 Type 1 diabetes mellitus with diabetic neuropathic arthropathy
- E10.618 Type 1 diabetes mellitus with other diabetic arthropathy
- E10.620 Type 1 diabetes mellitus with diabetic dermatitis
- E10.621 Type 1 diabetes mellitus with foot ulcer
- E10.622 Type 1 diabetes mellitus with other skin ulcer
- E10.628 Type 1 diabetes mellitus with other skin complications
- E10.630 Type 1 diabetes mellitus with periodontal disease
- E10.638 Type 1 diabetes mellitus with other oral complications
- E10.641 Type 1 diabetes mellitus with hypoglycemia with coma
- E10.649 Type 1 diabetes mellitus with hypoglycemia without coma
- E10.65 Type 1 diabetes mellitus with hyperglycemia
- E10.69 Type 1 diabetes mellitus with other specified complication
- E10.8 Type 1 diabetes mellitus with unspecified complications
- E10.A0 Type 1 diabetes mellitus, presymptomatic, unspecified
- E10.A1 Type 1 diabetes mellitus, presymptomatic, Stage 1
- E10.A2 Type 1 diabetes mellitus, presymptomatic, Stage 2
Common questions about type 1 diabetes ICD-10 codes
What is the ICD-10 code for type 1 diabetes?
- E10.9 — Type 1 diabetes mellitus without complications. More specific codes apply when the documentation supports them: E10.10, E10.11, E10.21, E10.22 and others below.
What is the ICD-10 code for type 1 diabetes mellitus with ketoacidosis without coma?
- E10.10 — Type 1 diabetes mellitus with ketoacidosis without coma.
What is the ICD-10 code for type 1 diabetes mellitus with ketoacidosis with coma?
- E10.11 — Type 1 diabetes mellitus with ketoacidosis with coma.
What is the ICD-10 code for type 1 diabetes mellitus with diabetic nephropathy?
- E10.21 — Type 1 diabetes mellitus with diabetic nephropathy.
What is the ICD-10 code for type 1 diabetes mellitus with diabetic chronic kidney disease?
- E10.22 — Type 1 diabetes mellitus with diabetic chronic kidney disease.
What is the ICD-10 code for type 1 diabetes mellitus with other diabetic kidney complication?
- E10.29 — Type 1 diabetes mellitus with other diabetic kidney complication.
What is the ICD-10 code for type 1 diabetes mellitus with unspecified diabetic retinopathy with macular edema?
- E10.311 — Type 1 diabetes mellitus with unspecified diabetic retinopathy with macular edema.
Is E10.9 billable?
- Yes. E10.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E10.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E10.9 as a principal diagnosis.
Is E10.9 a CC or MCC?
- No. E10.9 is neither a CC nor an MCC under MS-DRG v44.0.