Hyponatremia / hypoosmolarity

ICD10 Diagnosis
Dx:	Hyponatremia / hypoosmolarity
ICD10 code:	E87.1
Pre-ICD10 counterpart:	none assigned
Charlson/ALERT Scale:	none
APACHE Como Component:	none
APACHE Acute Component:	none
Start Date:
Stop Date:
Data Dependencies(Reports/Indicators/Data Elements):	No results
External ICD10 Documentation	ICD-10 CM Wikipedia ICD-10 Wikipedia WHO ICD10 documentation ICD10data.com

This diagnosis is a part of ICD10 collection.

• SMW
  • 2019-01-01
  • 2999-12-31
  • E87.1

• Cargo

• Categories

• SMW

• Cargo

• Categories

Additional Info

Repeated events

If this happens repeatedly during the same ward or unit stay, only code it the first time it happens, regardless of whether it is an Admit Diagnosis or Acquired Diagnosis, rather than each time it happens. See ICD10 codes only coded the first time for other diagnoses coded this way.

Example:

A person has a self-limited episode of A-fib. It goes away and then recurs. Only code the first one. A person has a self-limited episode of A-fib. It goes away but then he has an episode of V-tach. As this is a different diagnosis, both of these should be listed, but only code once each. Patient comes in with hypokalemia. It’s treated and remits, but the next day it recurs. Only code the first time.

• The parameter for coding hyponatremia is the following: (This change is active as of Feb 27, 2025)
  • Na+ <= 120
• Main signs and symptoms of hyponatremia are:
  • CNS - altered sensorium, seizures, coma
  • GI - anorexia, nausea/vomiting (these occur early)
  • neuromuscular - muscle cramps, hyporeflexia

Altered mental status coding guideline

Coding altered mental status in ICD10 can be complex, see ICD10 Guideline for coding altered mental status for more info.

Alternate ICD10s to consider coding instead or in addition

• Disorder of mineral metabolism, NOS
• Syndrome of inappropriate secretion of antidiuretic hormone (SIADH)
• Polydipsia
• Headache NOS
• Seizure, NOS
• Coma NOS
• Adrenal insufficiency, NOS
• Hypothyroidism
• Fluid overload
• Dehydration (volume depletion, hypovolemia)
• Encephalopathy, septic or metabolic

Candidate Combined ICD10 codes

Related CCI Codes

Data Integrity Checks (automatic list)

none found

Related Articles

Skin	Trauma	Renal/urinary	Infectious disease
ENT	Testing	Cardiovascular	Hereditary/congenital
Eye	Mechanism	Neoplastic	Heme/immunology
Misc	Reproductive	Gastrointestinal	Musculoskeletal/soft tissue
Psych	Respiratory	Poisoning
Neuro	Symptom/Sign	Endocrine disorder

Show all ICD10 Subcategories

ICD10 Categories: