What is ICD-10 code E09.8?

E09.8 is the ICD-10-CM diagnosis code for Drug or chemical induced diabetes mellitus with unspecified complications. It belongs to the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89). E09.8 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. E09.8 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. E09.8 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. E09.8 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for E09.8?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. E09.8 was a payment HCC under V24 (Diabetes with Chronic Complications) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting E09.8?

Always identify and document the specific drug or chemical causing the diabetes - use an additional code from the Table of Drugs and Chemicals to specify the causative agent and whether it was accidental or intentional If specific complications ARE documented (such as neuropathy, nephropathy, or retinopathy), use the more specific E09 subcategories (E09.2, E09.3, E09.4, etc.) rather than E09.8, as unspecified should only be used when complications are truly not specified Because E09.8 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

2026 ICD-10-CM E09.8: Drug or chemical induced

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupE09.8Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Diabetes mellitus (E08-E13)

E09.8

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Drug or chemical induced diabetes mellitus with unspecified complications

This code describes diabetes that develops as a side effect of taking certain medications or being exposed to specific chemicals, when the exact complications are not specified or documented. It's used when a drug or chemical is known to have caused the diabetes, but the medical record doesn't detail what specific problems have resulted from it.

Buddy Insight

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Mapped

HCC 18

Diabetes with Chronic Complic...

RAF 0.302

ACA/HHS

Mapped

HCC 21

HHS-HCC 21

Varies by metal level

ESRD/PACE

Mapped

HCC 18

Diabetes with Chronic Complic...

RAF 0.084

RXHCC

Mapped

HCC 30

Diabetes with Complications

RAF 0.495

Code Book Path

Official

E09Drug or chemical induced diabetes mellitus

E09.8Drug or chemical induced diabetes mellitus with unspecified complications

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for E09.8 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for E09.8 in this effective period.

Related Child Codes

Official

E09.0Drug or chemical induced diabetes mellitus with hyperosmolarity

E09.1Drug or chemical induced diabetes mellitus with ketoacidosis

E09.2Drug or chemical induced diabetes mellitus with kidney complications

E09.3Drug or chemical induced diabetes mellitus with ophthalmic complications

E09.4Drug or chemical induced diabetes mellitus with neurological complications

Includes

Official

ICD-10-CM does not list Includes notes for E09.8 in this effective period.

Excludes 1

Official

diabetes mellitus due to underlying condition (E08.-)
gestational diabetes (O24.4-)
neonatal diabetes mellitus (P70.2)
postpancreatectomy diabetes mellitus (E13.-)
postprocedural diabetes mellitus (E13.-)

Code First

Official

poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)

Use Additional

Official

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Code Also

Official

ICD-10-CM does not list Code Also instructions for E09.8 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

The causative drug or chemical must be documented.

While this code accepts unspecified complications, best practice requires documenting all identifiable complications to support more specific coding.

The medical record should reflect attempts to identify the specific complications.

If the complication becomes known, the code must be updated.

MEAT Support

HCC Buddy guidance

The causative drug or chemical must be documented.

While this code accepts unspecified complications, best practice requires documenting all identifiable complications to support more specific coding.

The medical record should reflect attempts to identify the specific complications.

If the complication becomes known, the code must be updated.

Audit Caution

HCC Buddy guidance

This code should rarely be used in practice, as most complications can be classified with available subcategories.

Using this code when specific complications are documented but not coded represents a missed coding opportunity.

Payers may downcode or deny claims with unspecified codes when medical records contain enough information for specific coding.

Common Mistakes

HCC Buddy guidance

E09.9 (without complications) is used when no complications are documented.

E09.69 (other specified complication) provides more specificity when the complication is known but does not fit standard categories.

Any specific complication code (E09.21-E09.65) is preferred over this unspecified code.

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is E09.8 an HCC code?

Yes. E09.8 maps to Diabetes with Chronic Complications under the V24 model but is not retained in V28.

Code: E09.8
Description: Drug or chemical induced diabetes mellitus with unspecified complications
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

V24HCC 18, Diabetes with Chronic Complications

0.302

ESRDHCC 18, Diabetes with Chronic Complications

0.084

RxHCCHCC 30, Diabetes with Complications

0.495

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work E09.8 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for E09.8

For E09.8 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed E09.8 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

Get the V28 RAF + MEAT cheat sheet

One printable page: confirm a code's V28 HCC status, its RAF weight, and the MEAT your note needs to make it stick. Free, no card.

Free PDF. No card. Unsubscribe anytime.

What This Code Means

E09.8 is the ICD-10-CM diagnosis code for drug or chemical induced diabetes mellitus with unspecified complications. This code describes diabetes that develops as a side effect of taking certain medications or being exposed to specific chemicals, when the exact complications are not specified or documented. It's used when a drug or chemical is known to have caused the diabetes, but the medical record doesn't detail what specific problems have resulted from it. E09.8 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering diabetes mellitus (e08-e13).

Under the older CMS-HCC V24 model, E09.8 maps to Diabetes with Chronic Complications (HCC 18) with a community, non-dual, aged base RAF weight of 0.302. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Always identify and document the specific drug or chemical causing the diabetes - use an additional code from the Table of Drugs and Chemicals to specify the causative agent and whether it was accidental or intentional. Because E09.8 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E09.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Always identify and document the specific drug or chemical causing the diabetes - use an additional code from the Table of Drugs and Chemicals to specify the causative agent and whether it was accidental or intentional
•If specific complications ARE documented (such as neuropathy, nephropathy, or retinopathy), use the more specific E09 subcategories (E09.2, E09.3, E09.4, etc.) rather than E09.8, as unspecified should only be used when complications are truly not specified

Clinical Significance

Drug or chemical induced diabetes mellitus with unspecified complications represents the least specific code for complicated drug-induced diabetes, indicating the provider has documented complications but their nature is not identified. This code signals a documentation gap that should be addressed through provider queries. Unspecified codes are increasingly scrutinized by payers and may not withstand audit review.

Documentation Requirements

✓The causative drug or chemical must be documented.
✓While this code accepts unspecified complications, best practice requires documenting all identifiable complications to support more specific coding.
✓The medical record should reflect attempts to identify the specific complications.
✓If the complication becomes known, the code must be updated.

Commonly Confused Codes

•E09.9 (without complications) is used when no complications are documented.
•E09.69 (other specified complication) provides more specificity when the complication is known but does not fit standard categories.
•Any specific complication code (E09.21-E09.65) is preferred over this unspecified code.