M31.4: Aortic arch syndrome [Takayasu]

M31.4, aortic arch syndrome [Takayasu], is listed as a covered diagnosis in 13 Medicare billing and coding articles that apply to 50 HCPCS Level II codes, including G0127 (Trimming of dystrophic nails, any number), A9552 (Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose…), A9598 (Positron emission tomography radiopharmaceutical…). The articles come from 5 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.

HCPCS Level II codes with M31.4 as a covered diagnosis

CodeDescriptionMedicare coverageDMEPOS fee 2026 (state range)Articles listing it
G0127Trimming of dystrophic nails, any numberSpecial coverage instructions apply—3
A9552Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuriesCarrier judgment—1
A9598Positron emission tomography radiopharmaceutical, diagnostic, for non-tumor identification, not otherwise classifiedCarrier judgment—1
A9601Flortaucipir f 18 injection, diagnostic, 1 millicurieCarrier judgment—1
J1745Injection, infliximab, excludes biosimilar, 10 mgSpecial coverage instructions apply—2
Q5104Injection, infliximab-abda, biosimilar, (renflexis), 10 mgSpecial coverage instructions apply—2
Q5103Injection, infliximab-dyyb, biosimilar, (inflectra), 10 mgSpecial coverage instructions apply—2
Q5121Injection, infliximab-axxq, biosimilar, (avsola), 10 mgCarrier judgment—2
J0461Injection, atropine sulfate, 0.01 mgSpecial coverage instructions apply—3
J0153Injection, adenosine, 1 mg (not to be used to report any adenosine phosphate compounds)Special coverage instructions apply—3
J1250Injection, dobutamine hydrochloride, per 250 mgSpecial coverage instructions apply—3
J0280Injection, aminophyllin, up to 250 mgSpecial coverage instructions apply—3
J1245Injection, dipyridamole, per 10 mgSpecial coverage instructions apply—3
A9700Supply of injectable contrast material for use in echocardiography, per studySpecial coverage instructions apply—3
G0278Iliac and/or femoral artery angiography, non-selective, bilateral or ipsilateral to catheter insertion, performed at the same time as cardiac catheterization and/or coronary angiography, includes positioning or placement of the catheter in the distal aorta or ipsilateral femoral or iliac artery, injection of dye, production of permanent images, and radiologic supervision and interpretation (list separately in addition to primary procedure)Carrier judgment—2
G0269Placement of occlusive device into either a venous or arterial access site, post surgical or interventional procedure (e.g., angioseal plug, vascular plug)Special coverage instructions apply—2
C8900Magnetic resonance angiography with contrast, abdomenSpecial coverage instructions apply—2
C8901Magnetic resonance angiography without contrast, abdomenSpecial coverage instructions apply—2
C8902Magnetic resonance angiography without contrast followed by with contrast, abdomenSpecial coverage instructions apply—2
C8909Magnetic resonance angiography with contrast, chest (excluding myocardium)Special coverage instructions apply—2
C8910Magnetic resonance angiography without contrast, chest (excluding myocardium)Special coverage instructions apply—2
C8911Magnetic resonance angiography without contrast followed by with contrast, chest (excluding myocardium)Special coverage instructions apply—2
C8912Magnetic resonance angiography with contrast, lower extremitySpecial coverage instructions apply—2
C8913Magnetic resonance angiography without contrast, lower extremitySpecial coverage instructions apply—2
C8914Magnetic resonance angiography without contrast followed by with contrast, lower extremitySpecial coverage instructions apply—2

25 more codes are listed. See every code with payment by region in Caduvo.

Medicare policy articles listing M31.4

A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.

Other M31 diagnoses (Other necrotizing vasculopathies)

Frequently asked questions

Does Medicare cover M31.4 (Aortic arch syndrome [Takayasu])?

Medicare covers items and services, not diagnoses. 13 Medicare billing and coding articles list M31.4 as a covered diagnosis for 50 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.

Which HCPCS codes can be billed with ICD-10 M31.4?

The Level II codes from the policies most specific to this diagnosis are G0127 (Trimming of dystrophic nails, any number, 3 articles); A9552 (Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose…, 1 article); A9598 (Positron emission tomography radiopharmaceutical…, 1 article); A9601 (Flortaucipir f 18 injection, diagnostic, 1 millicurie, 1 article); J1745 (Injection, infliximab, excludes biosimilar, 10 mg, 2 articles). Code choice depends on the item supplied; check each code's descriptor.

Which Medicare policy articles list M31.4?

A59318 (Billing and Coding: Positron Emission Tomography (PET) Scan for Inflammation and Infection); A57759 (Billing and Coding: Routine Foot Care and Debridement of Nails); A56432 (Billing and Coding: Infliximab), and 10 more articles.

What is ICD-10-CM code M31.4?

M31.4 is the ICD-10-CM code for aortic arch syndrome [Takayasu], in category M31 (Other necrotizing vasculopathies), chapter 13: Diseases of the musculoskeletal system and connective tissue.

Next steps

Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.

Chapter 13: Diseases of the musculoskeletal system and connective tissue · All diagnoses · HCPCS lookup