I99.8 — Other disorder of circulatory system
Is I99.8 billable?
Yes — I99.8 is billable for FY2027. I99.8 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. I99.8 may be submitted for encounters from October 1, 2026 through September 30, 2027.
I99.8 at a glance
| Code | I99.8 |
|---|---|
| Description | Other disorder of circulatory system |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does I99.8 group to?
I99.8 sits in MDC 05 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 302Atherosclerosis with MCCmedical
- 303Atherosclerosis without MCCmedical
How is I99.8 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I99.8. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Angiectasis, angiectopia
- Fluctuating blood pressure
- Ischemia, ischemic
- Atrophy, atrophic › vascular (of)
- Circulation › collateral, any site
- Complication › circulatory system (s) (from) (of)
- Congestion, congestive › circulatory NEC
- Dilatation › blood vessel
- Disease, diseased › circulatoryNEC
- Dissection › vascular
- Insufficiency, insufficient › arteriovenous
- Insufficiency, insufficient › circulatory NEC
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I99.8, but a patient may have both at the same time. When documentation supports it, I99.8 and the excluded code may both be reported.
- 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.-)
How long has I99.8 existed?
I99.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.