MD vs DOAllopathic & osteopathic medicine in the US

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.

Allopathic medicine (MD)

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)

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.

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.

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.

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.