2027 ICD-10-CM Diagnosis Code I99Other and unspecified disorders of circulatory system

ICD-10-CM Codes›I00–I99›I95-I99›I99

ICD-10-CM I99
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I99 is a non-billable ICD-10-CM category code for other and unspecified disorders of circulatory system, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I99.8 and I99.9.

Code Identity

ICD-10-CM Code
I99
Billable Status
No — Non-Billable Category
Code Describes
Other and unspecified disorders of circulatory system
Short Description
Other and unspecified disorders of circulatory system
Same as the full description in the CMS dataset.
Chapter
I95-I99
Other and unspecified disorders of the circulatory system

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI95-I99Other and unspecified disorders of the circulatory system
CategoryI99Other and unspecified disorders of circulatory system
This CodeI99Other and unspecified disorders of circulatory system

Specific Coding for Other and unspecified disorders of circulatory systemOverview

Non-specific codes like I99 require more characters. Use one of these billable codes instead:

  • Use I99.8 for Other disorder of circulatory system

  • Use I99.9 for Unspecified disorder of circulatory system

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I99: its own notes plus those printed at Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I99Overview

What is the ICD-10 code for other and unspecified disorders of circulatory system?

I99 is the ICD-10-CM category for other and unspecified disorders of circulatory system, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is I99 (Other and unspecified disorders of circulatory system) a billable code?

No. This is a category header that groups the codes for other and unspecified disorders of circulatory system, and headers cannot be submitted on claims. Claims for other and unspecified disorders of circulatory system need a more specific code from this category, such as I99.8 and I99.9.