What is ICD-10 code E23.6?

E23.6 is the ICD-10-CM diagnosis code for Other disorders of pituitary gland. A disorder affecting the pituitary gland (a small gland at the base of the brain that produces hormones) that does not fit into other specific pituitary disease categories. E23.6 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. E23.6 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. E23.6 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. E23.6 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 E23.6?

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. E23.6 was a payment HCC under V24 (Other Significant Endocrine and Metabolic Disorders) 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 E23.6?

This is a catch-all code for pituitary disorders not classified elsewhere; verify if a more specific code applies Document the specific pituitary dysfunction in the medical record for clarity Because E23.6 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 E23.6: Other disorders of pituitary

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 lookupE23.6Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Disorders of other endocrine glands (E20-E35)

E23.6

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

Other disorders of pituitary gland

A disorder affecting the pituitary gland (a small gland at the base of the brain that produces hormones) that does not fit into other specific pituitary disease categories.

Buddy Insight

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Mapped

HCC 23

Other Significant Endocrine a...

RAF 0.194

ACA/HHS

Mapped

HCC 30

HHS-HCC 30

Varies by metal level

ESRD/PACE

Mapped

HCC 23

Other Significant Endocrine a...

RAF 0.036

RXHCC

Mapped

HCC 43

Other Significant Endocrine a...

RAF 0.063

Code Book Path

Official

E23Hypofunction and other disorders of the pituitary gland

E23.6Other disorders of pituitary gland

Inclusion Terms

Official

Abscess of pituitary
Adiposogenital dystrophy

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for E23.6 in this effective period.

Related Child Codes

Official

E23.0Hypopituitarism

E23.1Drug-induced hypopituitarism

E23.2Diabetes insipidus

E23.3Hypothalamic dysfunction, not elsewhere classified

E23.7Disorder of pituitary gland, unspecified

Includes

Official

the listed conditions whether the disorder is in the pituitary or the hypothalamus

Excludes 1

Official

postprocedural hypopituitarism (E89.3)
short stature due to endocrine disorder (E34.3-)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for E23.6 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for E23.6 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for E23.6 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Document the specific pituitary disorder by name, clinical presentation, imaging findings (MRI of sella turcica), hormonal status of all pituitary axes, treatment provided, and follow-up plan.

MEAT Support

HCC Buddy guidance

Document the specific pituitary disorder by name, clinical presentation, imaging findings (MRI of sella turcica), hormonal status of all pituitary axes, treatment provided, and follow-up plan.

Audit Caution

HCC Buddy guidance

If the pituitary disorder has a more specific code (hypopituitarism, hyperfunction, or neoplasm), use that code instead.

This residual code requires documentation of a named condition that truly does not fit other categories.

Empty sella syndrome is an example that may be coded here.

Common Mistakes

HCC Buddy guidance

E23.0 (hypopituitarism when the issue is specifically hormone underproduction), E23.7 (unspecified pituitary disorder), D35.2 (benign neoplasm of pituitary), E22.x (pituitary hyperfunction codes).

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 E23.6 an HCC code?

Yes. E23.6 maps to Other Significant Endocrine and Metabolic Disorders under the V24 model but is not retained in V28.

Code: E23.6
Description: Other disorders of pituitary gland
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

V24HCC 23, Other Significant Endocrine and Metabolic Disorders

0.194

ESRDHCC 23, Other Significant Endocrine and Metabolic Disorders

0.036

RxHCCHCC 43, Other Significant Endocrine and Metabolic Disorders

0.063

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 E23.6 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for E23.6

For E23.6 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 E23.6 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

E23.6 is the ICD-10-CM diagnosis code for other disorders of pituitary gland. A disorder affecting the pituitary gland (a small gland at the base of the brain that produces hormones) that does not fit into other specific pituitary disease categories. E23.6 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering disorders of other endocrine glands (e20-e35).

Under the older CMS-HCC V24 model, E23.6 maps to Other Significant Endocrine and Metabolic Disorders (HCC 23) with a community, non-dual, aged base RAF weight of 0.194. 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.

This is a catch-all code for pituitary disorders not classified elsewhere; verify if a more specific code applies. Because E23.6 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 E23.6 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This is a catch-all code for pituitary disorders not classified elsewhere; verify if a more specific code applies
•Document the specific pituitary dysfunction in the medical record for clarity

Clinical Significance

Other disorders of the pituitary gland captures specified pituitary conditions not classifiable elsewhere, such as pituitary abscess, pituitary apoplexy (non-neoplastic), or rare infiltrative diseases affecting the gland. These conditions can present acutely with headache, visual changes, and hormonal crisis requiring emergent management.

Documentation Requirements

✓Document the specific pituitary disorder by name, clinical presentation, imaging findings (MRI of sella turcica), hormonal status of all pituitary axes, treatment provided, and follow-up plan.

Commonly Confused Codes

•E23.0 (hypopituitarism when the issue is specifically hormone underproduction), E23.7 (unspecified pituitary disorder), D35.2 (benign neoplasm of pituitary), E22.x (pituitary hyperfunction codes).