FY2027 ICD-10-CM reference
E10.65: Type 1 diabetes mellitus with hyperglycemia
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Type 1 diabetes mellitus with hyperglycemia. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Source: E00-E89 (chapter, inherited).
Excludes1
transitory endocrine and metabolic disorders specific to newborn (P70-P74)
Source: E00-E89 (chapter, inherited).
Includes
brittle diabetes (mellitus)
Source: E10 (category, inherited).
Includes
diabetes (mellitus) due to autoimmune process
Source: E10 (category, inherited).
Includes
diabetes (mellitus) due to immune mediated pancreatic islet beta-cell destruction
Source: E10 (category, inherited).
Includes
idiopathic diabetes (mellitus)
Source: E10 (category, inherited).
Includes
juvenile onset diabetes (mellitus)
Source: E10 (category, inherited).
Includes
ketosis-prone diabetes (mellitus)
Source: E10 (category, inherited).
Excludes1
diabetes mellitus due to underlying condition (E08.-)
Source: E10 (category, inherited).
Excludes1
drug or chemical induced diabetes mellitus (E09.-)
Source: E10 (category, inherited).
Excludes1
gestational diabetes (O24.4-)
Source: E10 (category, inherited).
Excludes1
hyperglycemia NOS (R73.9)
Source: E10 (category, inherited).
Excludes1
neonatal diabetes mellitus (P70.2)
Source: E10 (category, inherited).
Excludes1
postpancreatectomy diabetes mellitus (E13.-)
Source: E10 (category, inherited).
Excludes1
postprocedural diabetes mellitus (E13.-)
Source: E10 (category, inherited).
Excludes1
secondary diabetes mellitus NEC (E13.-)
Source: E10 (category, inherited).
Excludes1
type 2 diabetes mellitus (E11.-)
Source: E10 (category, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does E10.65 mean in FY2027?
The official ICD-10-CM descriptor is Type 1 diabetes mellitus with hyperglycemia. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is E10.65 billable in FY2027?
The FY2027 order file marks E10.65 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does E10.65 map to an HCC?
In the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service), E10.65 maps to CMS-HCC V28 HCC 38 (Diabetes with No, Glycemic, or Unspecified Complications). For 2027 dates of service, CMS has not yet published the payment year 2028 mappings. ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition