Listing 4.12 in 2026: How Social Security Decides Peripheral Arterial Disease Claims Under the Four Sub-Listings A B C D, Why the ABI 0.50 and Toe Pressure 30 mm Hg Thresholds Decide Most Cases, and What Wins When the Numbers Are Borderline

Published June 20, 2026 by Anthony Albert, Benefits Research Director, Disability Exchange. Sources cited from SSA Blue Book Listing 4.12, 20 CFR Part 404 Subpart P Appendix 1, Section 4.00 cardiovascular preamble, POMS DI 22505 series, and the 2024 ACC/AHA Lower Extremity PAD Guidelines.

Peripheral arterial disease affects roughly 10 to 12 million American adults, and the number rises sharply after age 65. About 1 in 5 people over 70 have PAD, and roughly 200,000 Americans undergo limb amputation each year, with PAD as a major underlying cause. Despite the size of the patient population, PAD claims under Social Security Disability are denied at the initial level more than 60 percent of the time. The reason almost always comes back to the numbers. Listing 4.12 is a test-driven listing. If the ABI, exercise ABI, toe pressure, or toe-brachial ratio numbers are not in the file, the claim does not meet the listing, even when the patient cannot walk a block without sitting down.

This is the deep walkthrough. We will go through Listing 4.12 sub by sub, what intermittent claudication has to look like, the four test-based paths under 4.12A, 4.12B, 4.12C, and 4.12D, the Doppler and imaging studies SSA actually wants, the 4.00G preamble guidance on PVD evaluation, what to do when the listing is not quite met, and how grid rules at sedentary RFC win many of these cases at age 50 and over.

Where Listing 4.12 sits in the rules

Listing 4.12 is part of Section 4.00 of the adult Listing of Impairments, codified at 20 CFR Part 404, Subpart P, Appendix 1. Section 4.00 covers cardiovascular system disorders generally, and the 4.00G preamble specifically addresses peripheral vascular disease. The full title of 4.12 is "Peripheral arterial disease, as determined by appropriate medically acceptable imaging." Two pieces have to be in place to meet 4.12: intermittent claudication, plus one of four test-based criteria labeled A through D.

Other cardiovascular listings that intersect with PAD include 4.11 chronic venous insufficiency (a different vascular pathology, not arterial), and 4.10 aneurysm of aorta or major branches (which can coexist with PAD). Listing 11.04 vascular insult to the brain covers cerebrovascular disease, which shares risk factors with PAD but is evaluated under a different listing.

The 4.00G preamble walks through how SSA evaluates PVD. It tells you that SSA will assess limitations based on symptoms together with physical findings, Doppler studies, other appropriate non-invasive studies, or angiographic findings if those are already in the record. SSA will not pay for invasive tests like angiography because of the risk and the cost. That means your file has to come from the studies your own treating doctors have already done.

Intermittent claudication, the gateway requirement

All four sub-listings under 4.12 require intermittent claudication. Without claudication, the listing does not apply, no matter how low your ABI is. Intermittent claudication is pain, cramping, fatigue, or aching in the calf, thigh, or buttock that comes on with walking or exercise and goes away with rest. The pain is reproducible at a similar walking distance. It is not random pain at rest. It is not pain from arthritis. It is not pain from venous insufficiency, which produces a heavy, aching, swelling feeling rather than the cramping vascular pain pattern.

The Rutherford classification helps frame the severity. Rutherford 1 is mild claudication. Rutherford 2 is moderate claudication. Rutherford 3 is severe claudication, where pain comes on after a very short walking distance. Rutherford 4 is rest pain. Rutherford 5 is minor tissue loss (non-healing ulcer). Rutherford 6 is major tissue loss (gangrene). Listing 4.12 requires at least clinical evidence of claudication, usually Rutherford 2 or higher.

Rest pain (Rutherford 4) and tissue loss (Rutherford 5 or 6) are technically "critical limb ischemia" and can support a claim under 4.12 if the test criteria are met, but these cases often also meet other listings like 1.20 amputation or qualify under medical-vocational rules without needing the listing at all. If you have an open ulcer or have lost a toe to PAD, your case has a strong route either way.

Listing 4.12A: resting ABI under 0.50

The simplest path is 4.12A. It is met when there is intermittent claudication plus a resting ankle-brachial index of less than 0.50. The ABI is a ratio of the systolic blood pressure measured at the ankle (posterior tibial or dorsalis pedis artery) to the systolic pressure measured at the brachial artery in the arm.

A normal ABI is 0.90 to 1.30. Mild PAD is 0.70 to 0.89. Moderate PAD is 0.40 to 0.69. Severe PAD is below 0.40. Listing 4.12A draws the line at less than 0.50, which captures most of the moderate-to-severe range. The number has to be a resting ABI, measured with the patient at rest, not after exercise.

The number also has to be on the worse leg, but practically speaking, if you have claudication, the affected leg is usually obviously the worse one. The ABI report should give you the number for both legs. Take the lower number. If it is under 0.50, paragraph A is met.

One technical caveat. ABI can be falsely elevated in patients with heavily calcified, non-compressible arteries. This is common in patients with diabetes, chronic kidney disease, or advanced age. An ABI above 1.30 is considered non-compressible and unreliable. If your ABI is unusually high but you have classic claudication symptoms, the file should pivot to toe pressure (paragraph C) or toe-brachial index (paragraph D), because the toe vessels are usually still compressible.

Listing 4.12B: exercise ABI drop of 50 percent

Listing 4.12B is met when there is intermittent claudication plus a decrease in systolic blood pressure at the ankle on exercise of 50 percent or more of the pre-exercise level, requiring 10 minutes or more to return to the pre-exercise level.

This path is for patients whose resting ABI is in the borderline range (0.50 to 0.80) but who have functional evidence of severe disease on exercise. The exercise ABI test is done on a treadmill at a fixed protocol, usually the Gardner-Skinner protocol (a graded treadmill with increasing speed and grade). Ankle pressures are measured before exercise, during exercise to the point of claudication, and at intervals after exercise stops.

To meet 4.12B, the ankle systolic pressure has to drop by 50 percent or more from baseline during exercise, and it has to take at least 10 minutes to recover. A pressure drop without prolonged recovery does not meet the listing. A short recovery time means the collateral circulation is adequate, even if the resting flow is reduced.

This path is less common than 4.12A because most PAD patients severe enough to file for SSDI already have a resting ABI under 0.50. But for patients with borderline resting numbers who still have severe symptoms, 4.12B can be a path. The test has to actually be done. If your file has only resting ABI, the case probably will not be approved under 4.12B no matter what your symptoms are.

Listing 4.12C: toe systolic under 30 mm Hg

Listing 4.12C is met when there is intermittent claudication plus a resting toe systolic pressure of less than 30 mm Hg. Normal toe systolic pressure is roughly 80 to 110 mm Hg. A pressure under 30 mm Hg is severe distal arterial disease, often correlating with critical limb ischemia and impaired wound healing.

This path is most useful for patients with non-compressible ankle arteries from diabetes or CKD, where ABI is unreliable but toe pressure is still measurable. Photoplethysmography (PPG) is the standard technique for measuring toe pressure. The PPG sensor is placed on the great toe, a small cuff is inflated around the toe, and the pressure at which arterial pulsation returns is recorded.

Toe pressure measurement is widely available in vascular labs and most hospital-based vascular surgery practices. It is less commonly done in primary care or outpatient internal medicine. If you have diabetes, advanced kidney disease, or an unusually high resting ABI, ask your vascular doctor for toe pressures.

Listing 4.12D: toe-brachial ratio under 0.40

Listing 4.12D is met when there is intermittent claudication plus a resting toe-brachial systolic pressure ratio of less than 0.40. The toe-brachial index (TBI) is calculated as the toe systolic pressure divided by the higher of the two brachial systolic pressures. Normal TBI is greater than or equal to 0.70.

TBI is the most sensitive test for distal PAD and the most reliable when calcified arteries make ABI unreliable. A TBI under 0.40 is consistent with severe distal disease and matches the diagnostic criteria for critical limb ischemia even before tissue loss.

Paragraphs C and D often appear together on the same vascular lab report. If your file has toe pressures, look for both the absolute value (paragraph C threshold of 30 mm Hg) and the ratio (paragraph D threshold of 0.40). Meeting either one alone is enough.

Imaging that supports the diagnosis

The 4.12 listing says PAD has to be determined by appropriate medically acceptable imaging. The 4.00G preamble lists Doppler studies, other non-invasive imaging, and angiographic findings as acceptable. Practically, this means:

• Arterial Doppler ultrasound of the lower extremities is the most common imaging study. It includes pulse volume recordings, segmental pressures, and waveform analysis. This study can document the location and severity of stenosis or occlusion at each level (aortoiliac, femoropopliteal, infrapopliteal).
• CT angiography (CTA) of the lower extremities is increasingly common, particularly when surgical planning is anticipated. CTA reports describe the anatomy and severity of disease and are strong objective evidence.
• MR angiography (MRA) is an alternative when iodinated contrast is contraindicated (severe renal disease). MRA quality has improved significantly, and reports from 2020 onward are usually acceptable to DDS.
• Catheter angiography is the gold standard but invasive. SSA will not order it, but if the patient has already had angiography for treatment planning, the report is strong evidence.

The imaging tells DDS where the disease is and how bad it is. The ABI, exercise ABI, or toe pressures tell DDS how it affects function. Both pieces should ideally be in the file.

The records that win these cases

Strong PAD files share a common set of records. The first is the vascular lab report with ABI, exercise ABI if done, toe pressures, and toe-brachial index. This is the single most important document. The numbers on this report decide the listing.

The second is the imaging report (arterial Doppler, CTA, or MRA) showing the location and severity of disease. The imaging confirms PAD as the diagnosis and rules out other causes of leg pain.

The third is the vascular surgery or cardiology consultation note that documents the clinical history, the Rutherford classification, the claudication distance, the treatment history (medical therapy, antiplatelet agents, statins, cilostazol, supervised exercise therapy, endovascular intervention, or bypass surgery), and the current functional status.

The fourth is records of interventions if any. Stent placement reports, atherectomy reports, and bypass operative notes all carry weight. They show how aggressive the disease has been and how well the patient has responded to treatment. A patient who has had multiple interventions and still has claudication has a stronger case than one who has not yet failed conservative therapy.

The fifth is wound care records if there is any tissue loss. Non-healing ulcers, gangrene, and amputation records all document severity and often push the case beyond 4.12 into critical limb ischemia territory.

What if the listing is not met

Many PAD patients have real functional limitation but do not quite meet the 4.12 thresholds. ABI is 0.60. Toe pressures are 40. Claudication is severe but the numbers are not. For these claimants, the path is residual functional capacity and the medical-vocational rules.

RFC for PAD usually involves reduced standing and walking tolerance, with the specific number of hours per day driven by the claudication distance. A patient who can walk a block before claudication forces a rest has a clear sedentary RFC. A patient who can walk 4 blocks may be limited to light work with restrictions on extended walking.

The 4.00G2 preamble explicitly asks SSA to consider how the PVD limits the ability to ambulate, stand, and perform other work-related activities. This is the door to a strong RFC argument. The treating doctor should write an opinion that quantifies the walking and standing tolerance using objective findings (ABI, claudication distance on supervised exercise, treadmill testing if done).

The grid rules become decisive. At sedentary RFC, a claimant who is 50 or older with no transferable skills from past relevant work and no recent education for direct entry into skilled work is generally found disabled under Grid Rule 201.14. At light RFC, the analysis is harder, and the case usually requires non-exertional limitations or a strong age-education-work history combination to win.

For claimants under 50, the grid rules are far less generous. The case usually requires a hearing with vocational testimony showing that the residual capacity, combined with non-exertional limitations like reduced concentration from chronic pain, off-task behavior from breakthrough claudication, or absenteeism from medical appointments, erodes the unskilled occupational base enough that no jobs exist in significant numbers.

Worked example: a 62-year-old former truck driver

Let's run a real-style claim. A 62-year-old former long-haul truck driver has type 2 diabetes for 18 years, smoked for 30 years (quit 5 years ago), and developed bilateral calf claudication starting 4 years ago. He cannot walk more than half a block before he has to stop.

His vascular Doppler shows bilateral superficial femoral artery occlusion with reconstitution at the popliteal level via collaterals. His resting ABI on the right is 0.42 and on the left is 0.48. He has tried cilostazol and a supervised exercise program with minimal improvement. He had a stent placed in the right SFA 2 years ago with restenosis 8 months later. He cannot afford another intervention.

Score it against 4.12. He has intermittent claudication clearly documented. His resting ABI on both sides is under 0.50. Paragraph A is met on the right (0.42) and the left (0.48). This is a strong listing approval.

What if his ABIs were 0.55 and 0.60 instead? Paragraph A would not be met. The next look is at toe pressures. If toe pressures are under 30 mm Hg, paragraph C is met. If TBI is under 0.40, paragraph D is met. If neither, the case shifts to RFC. As a 62-year-old former truck driver with sedentary RFC, no transferable skills, and limited education, Grid Rule 201.06 would likely find him disabled.

State-by-state notes

SSDI is federal. The listing applies the same in every state. But DDS approval rates on PAD claims vary. Massachusetts, California, and New York DDS offices tend to be more willing to develop the vascular records and approve at the listing level. Texas, Florida, and Georgia tend to deny initial PAD claims at a higher rate and force the case to hearing.

Access to vascular lab testing also varies by state. Urban areas have multiple vascular labs and same-day appointments. Rural areas may require driving 50 to 100 miles to get a proper ABI and toe pressure study. If you live in a rural area and your primary care doctor has only done an office-based ABI without segmental pressures or toe pressures, the file is likely incomplete for 4.12 purposes. Get to a vascular surgery practice or a hospital-based vascular lab.

State Medicaid coverage for PAD intervention varies widely. Massachusetts MassHealth and California Medi-Cal cover the full range of vascular interventions. Other states have prior authorization hurdles and benefit caps. If you are uninsured, look for federally qualified health centers and university-affiliated vascular surgery programs.

Related deep dives

• Listing 4.04 ischemic heart disease
• Listing 11.04 stroke
• Diabetes mellitus and SSDI
• Listing 1.20 amputation

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