Skip to main content
Call AIBook a demo

ICD-10-CM I25.700: Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris

I25.700 is the billable ICD-10-CM code for atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris, in category I25 (Chronic ischemic heart disease) of the Ischemic heart diseases section. As a principal diagnosis it groups to MS-DRG 302 Atherosclerosis with MCC, MS-DRG 303 Atherosclerosis without MCC (MDC 05 MDC 05: Diseases and Disorders of the Circulatory System). It maps to HCC 229 (Unstable Angina and Other Acute Ischemic Heart Disease) in CMS-HCC V28. As a secondary diagnosis it is a CC, excluded with 65 principal diagnoses. 26 LCD billing and coding articles list it as covered.

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
I25.700
billable FY2027 ICD-10-CM code
Category
I25 Chronic ischemic heart disease
Chapter
9: Diseases of the circulatory system (I00-I99)
CC/MCC (MS-DRG v44)
CC
CMS-HCC V28
HCC 229
POA reporting
Required

Tabular list notes for I25.700

The tabular list has no notes on I25.700 itself; the notes below apply from its parent headings.

Inherited from I25 (Chronic ischemic heart disease)

Excludes2 (not part of this condition, may be coded together)
  • non-ischemic myocardial injury (I5A)
Use additional code
  • code to identify:
  • chronic total occlusion of coronary artery (I25.82)
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Inherited from I25.7 (Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris)

Excludes1 (never coded together)
  • atherosclerosis of bypass graft(s) of transplanted heart without angina pectoris (I25.812)
  • atherosclerosis of coronary artery bypass graft(s) without angina pectoris (I25.810)
  • atherosclerosis of native coronary artery of transplanted heart without angina pectoris (I25.811)
Use additional code
  • code, if applicable, to identify:
  • coronary atherosclerosis due to calcified coronary lesion (I25.84)
  • coronary atherosclerosis due to lipid rich plaque (I25.83)

MS-DRG grouping when I25.700 is the principal diagnosis

MS-DRG v44 groups for I25.700 as principal diagnosis
MDCMS-DRGs
05 MDC 05: Diseases and Disorders of the Circulatory System302303

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for I25.700 shows the full grouping logic.

CC/MCC status and inpatient edits

As a secondary diagnosis, I25.700 is a CC under MS-DRG v44, unless the principal diagnosis is one of the 65 codes in its exclusion list. Check I25.700 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.
  • Medicare Code Editor: age conflict: adult diagnosis (age 15 to 124).

CMS-HCC V28 risk adjustment

In the PY2027 mapping, I25.700 maps to HCC 229 (Unstable Angina and Other Acute Ischemic Heart Disease). The HCC lookup shows the RAF weight and the hierarchy.

LCD billing and coding articles that list I25.700

26 current Medicare billing and coding articles list I25.700 among the diagnoses that support medical necessity for the services they cover.

For teams evaluating QuickIntell software

Evaluate software for diagnosis coding review

If your team codes diagnoses at volume, review how QuickCode supports qualified coder review of documentation, specificity queries and the billing handoff. Confirm the code sets, settings and reviewer responsibilities during evaluation; a code reference is not a coding determination for a patient.

Evaluate QuickCode for diagnosis codingSee risk adjustment review
Book a software demoAsk about a software workflow

Optional software evaluation, not payer support or help with an individual claim. For coverage or payment decisions, use the official sources on this page. Do not include patient information in a demo booking or inquiry.

Frequently asked questions

What does ICD-10-CM I25.700 mean?

I25.700 means atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris. It is one of 25 billable codes under I25, chronic ischemic heart disease.

Which MS-DRG does I25.700 group to?

As the principal diagnosis, I25.700 groups to MS-DRG 302 Atherosclerosis with MCC, MS-DRG 303 Atherosclerosis without MCC (MDC 05 MDC 05: Diseases and Disorders of the Circulatory System) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Does I25.700 map to an HCC?

Yes: HCC 229, Unstable Angina and Other Acute Ischemic Heart Disease, in the PY2027 CMS-HCC V28 mapping.

Is I25.700 a CC or MCC?

I25.700 is a CC under MS-DRG v44; 65 principal diagnoses exclude it.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.