E86.0 ICD-10-CM Code: Dehydration
HCC Buddy Code Card
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Metabolic disorders (E70-E88)
E86.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDehydration
Dehydration occurs when the body loses more fluids than it takes in, leading to an insufficient amount of water in the body. This can result from excessive sweating, vomiting, diarrhea, or inadequate fluid intake.
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
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for E86.0 in this effective period.
Excludes 2
Official- hypovolemic shock NOS (R57.1)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for E86.0 in this effective period.
Excludes 1
Official- dehydration of newborn (P74.1)
- postprocedural hypovolemic shock (T81.19)
- traumatic hypovolemic shock (T79.4)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for E86.0 in this effective period.
Use Additional
Official- code(s) for any associated disorders of electrolyte and acid-base balance (E87.-)
Code Also
OfficialICD-10-CM does not list Code Also instructions for E86.0 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 E86.0 an HCC code?
No. E86.0 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
E86.0 is the ICD-10-CM diagnosis code for dehydration. Dehydration occurs when the body loses more fluids than it takes in, leading to an insufficient amount of water in the body. This can result from excessive sweating, vomiting, diarrhea, or inadequate fluid intake. E86.0 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering metabolic disorders (e70-e88).
E86.0 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.
Always look for the underlying cause of dehydration (such as gastroenteritis, heat exhaustion, or medication side effects) and code it as an additional diagnosis if documented.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E86.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always look for the underlying cause of dehydration (such as gastroenteritis, heat exhaustion, or medication side effects) and code it as an additional diagnosis if documented
- •Dehydration is often a secondary condition; verify whether it is the primary reason for the encounter or a complication of another condition to ensure proper sequencing