Acceptable Medical Sources: Who Can Prove a Condition

Under 20 CFR 404.1521, a physical or mental impairment must be established by objective medical evidence from an acceptable medical source. The complete list of who qualifies appears at 20 CFR 404.1502(a), and it is shorter than most claimants expect: licensed physicians, certain psychologists, optometrists, podiatrists, speech-language pathologists, audiologists, advanced practice registered nurses, and physician assistants. Evidence from everyone else, however detailed and however caring the provider, can corroborate your condition but cannot prove it exists.

This single distinction explains a surprising number of denials. A claimant can submit years of consistent treatment from providers who are not on the list and still fail at step two, because under 20 CFR 404.1521 SSA will not use your statement of symptoms, a diagnosis, or a medical opinion to establish the existence of an impairment.

Why the Source Matters So Much

The disability analysis begins with a threshold question: do you have a medically determinable impairment? Under 20 CFR 404.1521, that impairment must result from anatomical, physiological, or psychological abnormalities that can be shown by medically acceptable clinical and laboratory diagnostic techniques.

Only objective medical evidence from an acceptable medical source can establish that threshold. Objective medical evidence is defined at 20 CFR 404.1502(f) as signs, laboratory findings, or both. Once the impairment is established, SSA moves on to whether it is severe, and then to the full five-step evaluation.

The rule does not dismiss other providers. It assigns them a different role in the sequence of proof.

The Full List of Acceptable Medical Sources

The definitions in 20 CFR 404.1502(a) carry scope limits that matter, so it is worth reading the list in detail.

A licensed physician means a medical or osteopathic doctor. A licensed psychologist includes a licensed or certified psychologist at the independent practice level, or a licensed or certified school psychologist, or another licensed individual who performs the same function as a school psychologist in a school setting, but only for impairments of intellectual disability, learning disabilities, and borderline intellectual functioning.

A licensed optometrist qualifies for impairments of visual disorders, or for measurement of visual acuity and visual fields only, depending on the scope of practice in the state. A licensed podiatrist qualifies for impairments of the foot, or the foot and ankle only, depending on state law.

A qualified speech-language pathologist qualifies for speech or language impairments only. To be qualified, the pathologist must be licensed by the state licensing agency, be fully certified by the state education agency, or hold a Certificate of Clinical Competence in Speech-Language Pathology from the American Speech-Language-Hearing Association.

The Three Sources Added in 2017

Three categories appear on the list only for claims filed on or after March 27, 2017. A licensed audiologist is an acceptable medical source for impairments of hearing loss, auditory processing disorders, and balance disorders within the licensed scope of practice. A licensed advanced practice registered nurse, or other licensed advanced practice nurse with another title, qualifies for impairments within the licensed scope of practice. And a licensed physician assistant qualifies for impairments within the licensed scope of practice.

The addition of physician assistants and advanced practice registered nurses reflects how routine care is actually delivered, particularly in rural areas and in clinics where a PA or nurse practitioner manages most visits. For claims filed before March 27, 2017, those providers were not acceptable medical sources, and records from them could not establish an impairment.

What Acceptable Sources Can Establish

An acceptable medical source does two distinct jobs. First, the source can establish that you have a medically determinable impairment, as 20 CFR 404.1521 requires. Second, the source can offer a medical opinion under 20 CFR 404.1513(a)(2), which is a statement about what you can still do despite your impairments.

That second category covers your ability to perform physical demands of work, mental demands such as understanding, remembering, maintaining concentration, persistence, or pace, other demands such as seeing and hearing, and your ability to adapt to environmental conditions like temperature extremes or fumes.

Other medical evidence, defined at 20 CFR 404.1513(a)(3), includes judgments about the nature and severity of your impairments, your medical history, clinical findings, diagnosis, treatment prescribed with your response, and prognosis. Records from an acceptable source are what populate all of these categories.

Everyone Else: Medical Sources That Corroborate

The definition of a medical source at 20 CFR 404.1502(d) is much broader than the definition of an acceptable medical source. It covers any individual licensed as a healthcare worker by a state and working within the permitted scope of practice, plus state-certified speech-language pathologists and school psychologists.

That broad definition includes physical therapists, occupational therapists, chiropractors, licensed clinical social workers, licensed professional counselors, and registered nurses who are not advanced practice nurses. Their treatment records can be rich, detailed, and highly relevant to your residual functional capacity. What they cannot do is carry the threshold finding that a medically determinable impairment exists.

For a claimant whose only treating providers fall in this group, the practical consequence is serious. Objective evidence from an acceptable medical source has to be somewhere in the record before anything else in the file can be weighed.

Nonmedical Sources and Their Role

A separate category altogether is the nonmedical source, defined at 20 CFR 404.1502(e). It includes you, educational personnel such as teachers, counselors, and daycare workers, public and private social welfare agency personnel, and family members, caregivers, friends, neighbors, employers, and clergy.

Evidence from nonmedical sources is defined at 20 CFR 404.1513(a)(4) as any information or statement about any issue in your claim. It is often the best available description of how your limitations appear day to day, outside the compressed view a clinician gets during an appointment.

Under 20 CFR 404.1520c(d), SSA is not required to explain how it considered nonmedical source evidence using the factors that apply to medical opinions. It remains part of the record from which your residual functional capacity is assessed under 20 CFR 404.1545.

Prior Administrative Medical Findings

One further category sits alongside opinions from your own providers. Under 20 CFR 404.1513(a)(5), a prior administrative medical finding is a finding about a medical issue made by the federal and state agency medical and psychological consultants at an earlier level of review in your claim, such as findings about the existence and severity of your impairments, your residual functional capacity, or whether a listing is met.

These findings are evaluated under the same 404.1520c factors as any other medical opinion. They are not treated as controlling either.

Matching the Source to the Proof You Need

The framework rewards records that pair the right source with the right issue. A podiatrist can establish a foot impairment but not your depression. A school psychologist can establish a learning disability but not a cardiac condition. A physician assistant can establish either, within the licensed scope of practice, in a claim filed after March 27, 2017.

Where your treating providers include both acceptable and non-acceptable sources, the strongest records usually combine them: the acceptable source establishes the impairment and offers functional limitations, while the broader treatment team documents severity and day-to-day function over time.

Frequently Asked Questions

Can a physician assistant establish my impairment for SSDI? Yes, for claims filed on or after March 27, 2017, 20 CFR 404.1502(a)(8) lists a licensed physician assistant as an acceptable medical source for impairments within the licensed scope of practice.

Is a chiropractor an acceptable medical source? No. A chiropractor is a medical source under 20 CFR 404.1502(d) but is not on the list of acceptable medical sources, so chiropractic records can support a claim but cannot by themselves establish that you have a medically determinable impairment.

Why does SSA require an acceptable medical source? Under 20 CFR 404.1521, a physical or mental impairment must be established by objective medical evidence from an acceptable medical source, and SSA will not use your statement of symptoms, a diagnosis, or a medical opinion to establish that an impairment exists.

This article provides general information about Social Security Disability Insurance eligibility and medical evidence rules, not legal advice. Federal regulations change over time, and state scope-of-practice laws affect which providers can establish which impairments. Consult a qualified representative or contact the Social Security Administration directly for guidance about your claim.