Version 2024

2024 ICD-10-CM Diagnosis Code M31.9

Necrotizing vasculopathy, unspecified

ICD-10-CM:: M31.9
Short Description:: Necrotizing vasculopathy, unspecified
Is Billable?: Yes - Valid for Submission
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Code Classification

Diseases of the musculoskeletal system and connective tissue
(M00–M99)
- Systemic connective tissue disorders
  (M30-M36)
  - Other necrotizing vasculopathies
    (M31)

M31.9 is a billable diagnosis code used to specify a medical diagnosis of necrotizing vasculopathy, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like M31.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

1. Approximate Synonyms
2. Clinical Information
3. Tabular List of Diseases and Injuries
4. Index to Diseases and Injuries References
5. Diagnostic Related Groups - MS-DRG Mapping
6. Convert to ICD-9 Code
7. Patient Education
8. Other Codes Used Similar Conditions
9. Code History

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Cryoglobulinemic vasculitis
Cutaneous complication of systemic sclerosis
Drug-induced necrotizing vasculitis
Lupus erythematosus-associated necrotizing vasculitis
Lupus vasculitis
Necrosis of artery
Necrotizing arteritis
Necrotizing cutaneous vasculitis
Necrotizing vasculitis
Necrotizing vasculitis due to mixed cryoglobulinemia
Necrotizing vasculitis secondary to connective tissue disease
Necrotizing vasculitis secondary to connective tissue disease
Scleroderma-associated necrotizing vasculitis
Small vessel vasculitis caused by immune complex
Vasculitis secondary to drug

Clinical Information

Necrotizing Vasculitis-. a rare condition that involves inflammation and necrosis of the walls of the blood vessels; may occur in rheumatoid arthritis.
Necrotizing Arteritis-. an arteritis characterized by the presence of inflammation and necrosis in the arterial wall.
Overlap Necrotizing Arteritis-. a necrotizing arteritis that exhibits characteristic features of several distinct vascular disorders.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

- Angiitis - I77.6
- - necrotizing - M31.9

- Arteritis - I77.6
- - necrosing or necrotizing - M31.9

- Vasculopathy, necrotizing - M31.9

Diagnostic Related Groups - MS-DRG Mapping

Diagnostic Related Groups (DRGs) are a classification system used to group together diagnosis codes for the purpose of reimbursement and healthcare management. DRGs are used to standardize the way hospitals and other providers are paid for inpatient services. In this system patients are grouped together based on their principal diagnosis in areas referred to as Major Diagnostic Categories (MDC). Once a patient is assigned a particular diagnostic category, providers receive a predetermined payment rate for the services rendered. This reimbursement rate is often fixed and is meant to cover the cost of care for that patient. Reimbursement is also affected by the relative weight of a diagnostic related group based on the severity of a patient's illness and the associated cost of care during hospitalization.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V41.0 applicable from 10/01/2023 through 09/30/2024.

MS-DRG	MS-DRG Title	MCD	Relative Weight
299	PERIPHERAL VASCULAR DISORDERS WITH MCC	05	1.5762
300	PERIPHERAL VASCULAR DISORDERS WITH CC	05	1.067
301	PERIPHERAL VASCULAR DISORDERS WITHOUT CC/MCC	05	0.7098

The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Convert to ICD-9-CM Code

Source ICD-10-CM Code		Target ICD-9-CM Code
M31.9		447.5 - Necrosis of artery
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Code History

FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.