E87.0 ICD-10-CM Code: Hyperosmolality and hypernatremia
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Metabolic disorders (E70-E88)
E87.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceHyperosmolality and hypernatremia
A condition where the blood has too much salt (sodium) relative to water, causing cells to shrink and potentially leading to confusion, seizures, or other neurological symptoms.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Sodium [Na] excess
- Sodium [Na] overload
Excludes 2
Official- diabetes with hyperosmolarity (E08, E09, E11, E13 with final characters .00 or .01)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for E87.0 in this effective period.
Excludes 1
Official- diabetes insipidus (E23.2)
- electrolyte imbalance associated with hyperemesis gravidarum (O21.1)
- electrolyte imbalance following ectopic or molar pregnancy (O08.5)
- familial periodic paralysis (G72.3)
- metabolic acidemia in newborn, unspecified (P19.9)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for E87.0 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for E87.0 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for E87.0 in this effective period.
Buddy Documentation Tip
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 E87.0 an HCC code?
No. E87.0 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- E87.0
- Description
- Hyperosmolality and hypernatremia
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
E87.0 is the ICD-10-CM diagnosis code for hyperosmolality and hypernatremia. A condition where the blood has too much salt (sodium) relative to water, causing cells to shrink and potentially leading to confusion, seizures, or other neurological symptoms. E87.0 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering metabolic disorders (e70-e88).
E87.0 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Document the severity (mild, moderate, severe) and acuity (acute vs. chronic) when available.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E87.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the severity (mild, moderate, severe) and acuity (acute vs. chronic) when available
- •Identify the underlying cause such as excessive water loss, inadequate water intake, or sodium retention