2026 ICD-10-CM Diagnosis Code I73.01Raynaud's syndrome with gangrene
ICD-10-CM Codes›I00–I99›I70-I79›I73
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 263
- Chronic Condition
I73.01 is a billable ICD-10-CM diagnosis code for Raynaud's syndrome with gangrene. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 545 through 547. 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 46 closely related codes. Coders also document this condition as gangrene due to Raynaud disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gangrene and Peripheral and visceral vascular disease.
For Medicare Advantage risk adjustment, I73.01 maps to CMS-HCC Category 263 (Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene) under the V28 model, adding a risk factor of about 1.118 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I73.01 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 2026.
Source: CMS Payment Year 2026 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.
- Gangrene due to Raynaud disease
- Gangrene due to secondary Raynaud phenomenon
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
paroxysmal digital See: Raynaud's disease;
with gangrene I73.01
Gangrene, gangrenous (connective tissue) (dropsical) (dry) (moist) (skin) (ulcer) See Also: Necrosis; I96
symmetrical I73.01
Syndrome See Also: Disease;
with gangrene I73.01
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Gangrene
Gangrene is the death of tissues in your body. It happens when a part of your body loses its blood supply. Gangrene can happen on the surface of the body, such as on the skin, or inside the body, in muscles or organs. Causes include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I73.01 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I73.01Overview
What is the ICD-10 code for Raynaud's syndrome with gangrene?
The ICD-10-CM code for Raynaud's syndrome with gangrene is I73.01 (sometimes written as I7301). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is I73.01 (Raynaud's syndrome) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Raynaud's syndrome with gangrene on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does I73.01 group to?
When Raynaud's syndrome with gangrene is the principal diagnosis on an inpatient stay, it groups to MS-DRG 545, 546, 547, with relative weights from 0.8362 to 2.4817 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I73.01 a CC or MCC?
CMS lists I73.01 as a CC (complication or comorbidity) for FY 2026. 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 46 closely related codes in its exclusion list.
What is the ICD-9 equivalent of I73.01?
Under the General Equivalence Mappings, Raynaud's syndrome with gangrene converts to ICD-9-CM 443.0 (Raynaud's syndrome) and 785.4 (gangrene). The mapping is approximate, so confirm the match fits the documentation.
What HCC is I73.01?
I73.01 (Raynaud's syndrome with gangrene) maps to CMS-HCC Category 263 (Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene), commonly written as HCC 263, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. It mapped to HCC 106 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does I73.01 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I73.01 adds a risk adjustment factor of about 1.118 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.696 to 1.432 depending on the payment segment). HCC 263 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 263 category page.
