E87.8 ICD-10-CM Code: Other disorders of electrolyte and fluid balance, not elsewhere classified
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Metabolic disorders (E70-E88)
E87.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther disorders of electrolyte and fluid balance, not elsewhere classified
Various imbalances in electrolytes (minerals like sodium, chloride) and body fluids that don't fit into other specific categories.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
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Code Book Path
Inclusion Terms
Official- Electrolyte imbalance NOS
- Hyperchloremia
- Hypochloremia
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for E87.8 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for E87.8 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 E87.8 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for E87.8 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for E87.8 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is E87.8 an HCC code?
No. E87.8 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
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
E87.8 is the ICD-10-CM diagnosis code for other disorders of electrolyte and fluid balance, not elsewhere classified. Various imbalances in electrolytes (minerals like sodium, chloride) and body fluids that don't fit into other specific categories. E87.8 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering metabolic disorders (e70-e88).
E87.8 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.
This is a residual code; use only when a more specific electrolyte or fluid balance code doesn't apply.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E87.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a residual code; use only when a more specific electrolyte or fluid balance code doesn't apply
- •Document the specific electrolyte abnormality for better clinical clarity