2027 ICD-10-CM Diagnosis Code I25.700Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris
ICD-10-CM Codes›I00–I99›I20-I25›I25
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 229
- Chronic Condition
I25.700 is a billable ICD-10-CM diagnosis code for atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 302 through 303. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 65 closely related codes. The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). Coders also document this condition as angina co-occurrent and due to arteriosclerosis of coronary artery bypass graft. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Coronary atherosclerosis and other heart disease.
For Medicare Advantage risk adjustment, I25.700 maps to CMS-HCC Category 229 (Unstable Angina and Other Acute Ischemic Heart Disease) under the V28 model, adding a risk factor of about 0.240 for a community, non-dual, aged beneficiary in payment year 2027.
This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such selected atherosclerosis, ischemia, and infarction.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for I25.700.
Medicare Risk Adjustment (HCC)Billing
I25.700 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Angina co-occurrent and due to arteriosclerosis of coronary artery bypass graft
- Preinfarction syndrome
- Unstable angina co-occurrent and due to arteriosclerosis of coronary artery bypass graft
- Unstable angina co-occurrent and due to coronary arteriosclerosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I25.700: its own notes plus those printed at I25.7, I25, block I20-I25, and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- unstable angina pectoris without atherosclerosis of coronary artery bypass graft (I20.0)
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.
- 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.-)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I25.700, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming I25.700: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 4
These codes carry an Excludes2 note naming I25.700: its condition is not part of those codes, and both may be reported when the patient has both.
- I25.1 Atherosclerotic heart disease of native coronary arteryatherosclerosis of coronary artery bypass graft(s) and transplanted heart (I25.7-) names I25.7-, which includes this code
- I25.5 Ischemic cardiomyopathycoronary atherosclerosis (I25.1-, I25.7-) names I25.7-, which includes this code
- I74 Arterial embolism and thrombosis
- I82 Other venous embolism and thrombosis
Code First 3
These codes say to code first a condition named in the note, and I25.700 is one of the conditions named.
- I25.82 Chronic total occlusion of coronary arterycoronary atherosclerosis (I25.1-, I25.7-, I25.81-) names I25.7-, which includes this code
- I25.83 Coronary atherosclerosis due to lipid rich plaquecoronary atherosclerosis (I25.1-, I25.7-, I25.81-) names I25.7-, which includes this code
- I25.84 Coronary atherosclerosis due to calcified coronary lesioncoronary atherosclerosis (I25.1-, I25.7-, I25.81-) names I25.7-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Angina
Angina is chest pain or discomfort you feel when there is not enough blood flow to your heart muscle. Your heart muscle needs the oxygen that the blood carries. Angina may feel like pressure or a squeezing pain in your chest. It may feel like indigestion. You may also feel pain in your shoulders, arms, neck, jaw, or back.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I25.700 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I25.700Overview
Is I25.700 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I25.700 group to?
When atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris is the principal diagnosis on an inpatient stay, it groups to MS-DRG 302, 303, with relative weights from 0.6610 to 1.1993 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I25.700 a CC or MCC?
CMS lists I25.700 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 65 closely related codes in its exclusion list.
Who can I25.700 be reported for?
The Medicare Code Editor checks atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.
Can I25.700 be reported with I20.0?
Not as a rule. The Excludes1 note on I25.700 lists "unstable angina pectoris without atherosclerosis of coronary artery bypass graft (I20.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is I25.700?
I25.700 (atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris) maps to CMS-HCC Category 229 (Unstable Angina and Other Acute Ischemic Heart Disease), commonly written as HCC 229, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 87 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 188.
Does I25.700 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I25.700 adds a risk adjustment factor of about 0.240 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.240 to 0.458 depending on the payment segment). A more severe related category (HCC 228) supersedes it when both are reported. See the full factor table on the HCC 229 category page.
