ICD-10-CM 2027
ICD-10 code for Fluctuating blood pressure
From the official ICD-10-CM alphabetic index entry “Fluctuating blood pressure”. Page updated September 29, 2026.
About coding Fluctuating blood pressure
The ICD-10-CM code for Fluctuating blood pressure is I99.8 (Other disorder of circulatory system).
Within I99, choose I99.8 (Other disorder of circulatory system) only when documentation doesn't support a more specific option: unspecified disorder of circulatory system (I99.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 302 (Atherosclerosis with MCC, relative weight 1.1984) and DRG 303 (Atherosclerosis without MCC, relative weight 0.6612), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Fluctuating blood pressure ICD-10 codes
What is the ICD-10 code for Fluctuating blood pressure?
- I99.8 — Other disorder of circulatory system.
Is I99.8 billable?
- Yes. I99.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I99.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I99.8 as a principal diagnosis.
Is I99.8 a CC or MCC?
- No. I99.8 is neither a CC nor an MCC under MS-DRG v44.0.