AACOMAS Application Guide 2026: How to Apply to DO Medical Schools

What Is AACOMAS?

The American Association of Colleges of Osteopathic Medicine Application Service (AACOMAS) is the centralized application system for US osteopathic (DO) medical schools. If you are considering a career as a Doctor of Osteopathic Medicine, AACOMAS is your primary application portal.

Like AMCAS for MD schools, AACOMAS lets you submit one application that gets verified and sent to all the DO schools you select. The service handles your academic records, MCAT scores, personal statement, and experiences.

MD vs. DO: Understanding the Difference

Before diving into the application, it is worth understanding what distinguishes osteopathic medicine. DOs receive the same core medical training as MDs and can practice in every specialty. The key difference is that osteopathic medical education includes additional training in Osteopathic Manipulative Treatment (OMT) and emphasizes a whole-body, holistic approach to patient care.

DOs and MDs take the same licensing exams (USMLE or COMLEX), complete the same residency programs, and practice side by side in hospitals across the country. The historical stigma around DO programs has diminished significantly, though some competitive specialties still show a preference for MD applicants.

Consider applying DO if:

• You are drawn to the osteopathic philosophy of treating the whole person
• You want to maximize your chances of admission by applying broadly
• You had meaningful exposure to osteopathic physicians or OMT
• Your GPA or MCAT scores are below the median for your target MD schools

How AACOMAS Differs from AMCAS

While the two applications share a similar structure, there are important differences:

Personal Statement

Both AMCAS and AACOMAS allow 5,300 characters, but AACOMAS asks a more specific question: why do you want to pursue osteopathic medicine? If you are applying to both MD and DO schools, you cannot simply copy your AMCAS personal statement. Your AACOMAS essay must address your understanding of and interest in osteopathic principles.

Tips for the AACOMAS personal statement:

• Reference specific experiences with DOs or OMT
• Explain what drew you to the osteopathic philosophy, not just that you want to be a doctor
• Avoid saying you are applying DO as a backup plan, even if that is part of your strategy
• Connect your personal values to the holistic, patient-centered approach of osteopathic medicine

Experiences and Achievements

AACOMAS does not cap the number of experiences you can list (unlike AMCAS's 15-entry limit). However, there is no "Most Meaningful" designation. Each entry gets a description field, but you do not get the extra 1,325 characters that AMCAS provides for your top three.

This means every entry needs to stand on its own. Be concise and impact-focused in each description.

GPA Calculation

AACOMAS calculates your GPA differently from AMCAS. The science GPA categories are not identical, and grade replacement policies differ. If you retook courses, AACOMAS may treat them differently than AMCAS does. Check the current AACOMAS guidelines for how repeated coursework is handled.

Letters of Recommendation

AACOMAS requires 2 to 6 letters. The most important distinction: at least one letter should come from a DO. If you have not worked with a DO, seek out shadowing or clinical volunteer opportunities with osteopathic physicians before you apply.

AACOMAS Application Timeline

The AACOMAS timeline runs roughly parallel to AMCAS:

January-April: Draft your personal statement with the osteopathic focus. Secure a letter from a DO. Study for or retake the MCAT.

May 5, 2026: AACOMAS opens for submissions.

May-June: Submit your primary application as early as possible. Like AMCAS, earlier submission generally means earlier review.

June-August: Verification period. Pre-write secondary essays for your target schools.

July-October: Secondary applications arrive. Respond promptly.

September-March: Interview season. Many DO schools use MMI format.

October-April: Acceptance decisions.

MCAT Scores for DO Schools

The median MCAT score for DO matriculants is typically lower than for MD schools, generally in the 504-506 range. However, competitive DO programs (like PCOM, NYITCOM, or Touro) may have medians closer to 510.

A strong MCAT score combined with meaningful osteopathic exposure can make you a competitive applicant at top DO programs.

Check out our MCAT prep course rankings to find the right study program for your target score.

Common AACOMAS Mistakes

Treating it as a backup application. Admissions committees at DO schools can tell when an applicant has no genuine interest in osteopathic medicine. If you cannot articulate why you want to be a DO specifically, your application will be weaker.

Copying your AMCAS personal statement. The AACOMAS personal statement must address osteopathic medicine directly. A generic "I want to help people" essay without DO-specific content will not be competitive.

Skipping DO exposure. Not having any shadowing or clinical experience with a DO is a significant gap. Even a few days of shadowing demonstrates genuine interest.

Ignoring school-specific missions. DO schools often have strong community health, rural medicine, or underserved population missions. Tailor your secondaries to align with each school's values.

Final Advice

Applying through AACOMAS is not a lesser path. Osteopathic medicine produces excellent physicians who practice in every specialty across the country. If you are genuinely interested in the osteopathic approach, your application will reflect that authenticity. If you are applying broadly to maximize your chances, invest the time to understand what makes DO education distinct so your application reads as intentional rather than incidental.

Also see: AMCAS Guide for US MD Schools | OMSAS Guide for Canadian Med Schools | AMCAS vs AACOMAS vs OMSAS Compared