ICD10
ICD-10 Code I99: Other and unspecified disorders of circulatory system
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).
When is it used?
- May be used when a clinician documents other and unspecified disorders of circulatory system in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
Code hierarchy
chapter
9Diseases of the circulatory system (I00-I99)
block
I95-I99Other and unspecified disorders of the circulatory system
currentI95-I99
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
CardiologistGeneral Physician
Related codes
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 248497002high
Abdominal wall veins distended
Source: SNOMED International ICD-10 map
SNOMED_CT 486006high
Acute vascular insufficiency
Source: SNOMED International ICD-10 map
SNOMED_CT 16415501000119100high
Acute visceral ischemia
Source: SNOMED International ICD-10 map
SNOMED_CT 238778000high
Angiodyskinesia
Source: SNOMED International ICD-10 map
SNOMED_CT 233957006high
Arterial ischemia
Source: SNOMED International ICD-10 map
SNOMED_CT 271137009high
Bad circulation - vasomotor change
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
I99
Replacement codes
I99.8 — Other disorder of circulatory systemI99.9 — Unspecified disorder of circulatory system
Common synonyms
Other and unspecified disorders of circulatory systemOther and disorders of circulatory system
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.