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MD vs DO — allopathic and osteopathic medicine in the United States

AMCAS · AACOMAS · USMLE · COMLEX · Residency Match

Both the MD (Doctor of Medicine) and DO (Doctor of Osteopathic Medicine) degrees produce fully licensed independent physicians in the United States. Both graduates can prescribe medications, perform surgery, and practise in any specialty — the distinction lies in history, philosophy, curriculum emphasis, and the licensing exam pathway, not in legal scope of practice. This guide covers every meaningful difference between the two pathways to help you make an informed strategic choice.

MD vs DO at a glance

FeatureMD (Allopathic)DO (Osteopathic)
Accrediting bodyLCMECOCA (via AACOM)
Application serviceAMCASAACOMAS
Number of schools (~2025)~155~47 COCA-accredited colleges (~74 teaching locations)
Average MCAT (matriculants)~511.7~503–507
Average GPA (matriculants)~3.77~3.55–3.65
Acceptance rate (national)~5–7%~30%+
Licensing examUSMLE (Steps 1, 2 CK)COMLEX-USA (Levels 1, 2, 3)
Unique curriculumStandard biomedical model+~200 hrs OMT/OPP
Residency matchNRMP (single match since 2020)NRMP (same match since 2020)
US legal statusFull independent physicianFull independent physician

History and philosophy

Allopathic medicine (MD) follows the conventional biomedical model — disease is understood as resulting from biological dysfunction, and treatment focuses on correcting or compensating for that dysfunction through pharmaceuticals, surgery, and evidence-based interventions. MD programmes are accredited by the Liaison Committee on Medical Education (LCME).

Osteopathic medicine (DO) was founded in the late 19th century by Andrew Taylor Still, who emphasised the interconnection of the body's musculoskeletal system with its overall health, and developed a whole-person philosophy — mind, body, and spirit — as a framework for medical practice. DO programmes are accredited by the Commission on Osteopathic College Accreditation (COCA) through the American Association of Colleges of Osteopathic Medicine (AACOM).

In practice, the philosophical distinctions between MD and DO training have narrowed significantly — both use evidence-based medicine, both train students in the same clinical environments, and the vast majority of clinical practice looks identical. The DO degree adds osteopathic manipulative treatment (OMT) training, which is the primary concrete curricular difference.

Application differences — AMCAS vs AACOMAS

MD applications go through AMCAS (American Medical College Application Service). DO applications go through AACOMAS (American Association of Colleges of Osteopathic Medicine Application Service). Texas applicants to public schools use TMDSAS for both MD and DO Texas schools.

These are separate applications with distinct requirements:

  • Personal statement: AMCAS (5,300 chars) vs AACOMAS (5,300 chars). The AACOMAS PS should address osteopathic philosophy; the AMCAS PS has no such requirement.
  • GPA calculation: AMCAS and AACOMAS calculate GPA differently — AACOMAS may recalculate courses differently (e.g., grade replacements). Check both calculations carefully.
  • MCAT: Required by both. Scores are valid for 3 years on most programmes.
  • Timeline: Both open approximately May–June; submit both as close to opening day as possible for maximum rolling-admission advantage.
  • Cost: Both charge per-school fees — budget for both applications if applying to both systems.

Licensing exams — USMLE vs COMLEX

MD students sit USMLE (United States Medical Licensing Examination) — Steps 1, 2 CK, and 3. USMLE Step 1 changed to pass/fail scoring in 2022. USMLE Step 2 CK remains numerically scored and is now the primary academic signal for residency programmes.

DO students sit COMLEX-USA (Comprehensive Osteopathic Medical Licensing Examination of the United States) — Levels 1, 2, and 3. COMLEX is required by all DO students for licensure.

Many DO students also voluntarily sit USMLE Steps 1 and 2 CK — particularly those applying to competitive specialties or to residency programmes that have historically recruited primarily from MD schools. Taking both examinations adds cost and preparation time, but is strategically advantageous for competitive specialties (dermatology, orthopaedic surgery, plastic surgery, neurosurgery, ENT, radiation oncology).

If you are a DO student aiming for a competitive specialty, you should plan to take USMLE as well as COMLEX — and aim for strong USMLE scores, not just passing.

Residency match — what changed in 2020

In 2020, the AOA (American Osteopathic Association) match merged with the NRMP (National Resident Matching Program) into a single unified match. This was a significant change: before 2020, DO graduates had a separate match pathway that included AOA-accredited residency programmes. After 2020, all graduates — MD and DO — compete in the same NRMP match for all residency positions.

In practice, this means DO graduates can now apply to every residency programme in the country. Many DO graduates match into competitive specialties and highly ranked programmes. However, the data shows persistent differences in match outcomes:

  • DO students match into competitive specialties (derm, plastics, ortho) at lower rates on average than MD students.
  • DO students are well represented in primary care, family medicine, internal medicine, and psychiatry.
  • DO students who take USMLE and score competitively have substantially better match outcomes in competitive programmes.
  • Programme selection matters — some programmes actively recruit DO students; others de-emphasise the degree in favour of USMLE scores.

Strategic mistakes to avoid

  • Treating DO as a backup you don't really want. DO is a real pathway to full physician licensure, not a consolation prize. Applicants who treat it as a backup tend to underinvest in their AACOMAS application — writing weak personal statements that don't address osteopathic philosophy, skipping OMT interview preparation, and failing to research DO school missions. This shows, and it reduces your DO acceptance odds significantly.
  • Not researching individual DO school missions. DO schools vary significantly in emphasis — some are strongly mission-driven toward primary care and underserved communities; others emphasise research or hospital-based training. Not tailoring your secondary applications to each school's mission is as much a mistake for DO schools as it is for MD schools.
  • Not preparing for OMT/OPP interview questions. DO school interviews routinely include questions about osteopathic philosophy: "Why osteopathic medicine specifically?" "What do you know about OMT?" "How does the mind-body-spirit model influence your approach to patient care?" Applicants who have not prepared substantive answers to these questions perform poorly in DO interviews — even applicants who are genuinely interested in the DO pathway.
  • Assuming DO graduates can't match into competitive specialties. This is outdated. Since the 2020 unified match, DO graduates regularly match into dermatology, plastics, orthopaedics, and other competitive specialties. DO students who prepare strategically — taking USMLE, scoring well, and applying to the right programme mix — compete effectively in these fields.

Get strategic advice on your MD and DO applications

One-to-one coaching for AMCAS and AACOMAS applications, school list building, personal statement review, and interview preparation — from specialists with first-hand knowledge of both pathways.

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Frequently asked questions

Both MD (Doctor of Medicine) and DO (Doctor of Osteopathic Medicine) are fully licensed physicians in the United States. Both can prescribe medications, perform surgery, and practise independently in all 50 states. The two degrees are legally equivalent for the purposes of US medical practice. The differences lie in philosophy, curriculum emphasis, and the licensing examination pathway — not in scope of practice.

MD schools are statistically more selective. The average MCAT for MD matriculants nationally is approximately 511.7 (AAMC 2023–24 data); the average for DO matriculants is approximately 503–507. GPA medians are similarly higher for MD schools (~3.77 cumulative) than DO schools (~3.55–3.65). Per-applicant acceptance rates also differ substantially: the overall MD acceptance rate is approximately 5–7% nationally, while DO schools accept approximately 30%+ of applicants. However, both pathways require dedicated preparation and a competitive application.

Yes, for most applicants. There is no strategic reason to limit yourself to one system. Applying to 20–30 MD schools via AMCAS and 10–15 DO schools via AACOMAS simultaneously is common practice. The personal statements, activity descriptions, and supplemental essays differ between the two systems — particularly AACOMAS, which expects engagement with osteopathic philosophy — but the investment in preparing both applications is worthwhile given the potential to significantly expand your matched school options.

Yes, but the statistics remain uneven. Since the 2020 merger of the AOA and NRMP match systems, DO graduates compete directly with MD graduates for all residency positions. DO graduates successfully match into competitive specialties including dermatology, plastic surgery, orthopaedic surgery, ENT, and radiation oncology — but at lower rates than MD graduates on average. DO applicants who also take USMLE Step 1 and Step 2 CK (in addition to COMLEX) are most competitive for programmes that historically preferred MD graduates.

OMT (Osteopathic Manipulative Treatment) — also called OPP (Osteopathic Principles and Practice) — is a hands-on physical manipulation approach to diagnosis and treatment rooted in osteopathic philosophy. DO curricula typically include approximately 200 hours of OMT/OPP training spread across the four pre-clinical and clinical years. In practice, most DO physicians do not use OMT regularly in their clinical work — particularly those in specialties where it is not relevant. However, understanding osteopathic philosophy and demonstrating familiarity with OPP is expected in DO school interviews.

The DO degree is fully recognised in the United States, UK, Canada, Australia, and most countries. Some countries (particularly in parts of Europe and Asia) have historically had limited recognition of US DO graduates — though this is changing. If you plan to practise outside the US after training, researching the specific recognition status of the DO degree in your target country before committing to the DO pathway is advisable.

Related US guides

Reviewed by Isaac Butler-King, medical student at the University of Glasgow. Last reviewed: June 3, 2026
MD vs DO — Full Comparison of US Allopathic and Osteopathic Medicine (2025) | NGMP