nvshelat said:
You said all schools. NYCOM, UMDNJ, and PCOM don't require one. OSU-COM doesn't qualify as all schools. Therefore, you are wrong.
There are only a few schools that don't require a letter from a physician. Those that don't, "strongly" suggest one. The actual requirements are below:
KCOM: Two letters of evaluation: one from a premedical advisor, premedical committee, or a science faculty member and
one from a physician (D.O. or M.D.) or a past or present employer
AZCOM: Two letters of recommendation;
one must be from a physician (D.O. or M.D.) and the other from a premedical advisory committee or a science professor.
CCOM: Two letters of recommendation;
one must be from a physician (strongly recommend a DO, or a MD.) and the other must be from a premedical advisory committee or science faculty member.
DMU:
Medical exposure letter written by a physician (D.O. or M.D.) or a nurse or volunteer coordinator describing your patient exposure experiences AND
KCUMB: One letter of evaluation from each of the following:
 Premedical advisor or committee
 Science faculty

Physician (preferably a D.O.)
LECOM:
Letter of recommendation from an osteopathic physician who is not related to the applicant
NSUCOM: A letter of evaluation
from an osteopathic physician is also required
NYCOM: Letter of recommendation from an osteopathic physician is not required but is highly recommended
OSUCOM:
Letter of recommendation from an osteopathic physician
OUCOM: Letter of recommendation from an osteopathic physician is highly recommended
PCOM: Letter of evaluation from an osteopathic physician is advised, but not required.
PCSOM: A letter from
osteopathic physician, who is a member of the AOA, is required.
TUCOM: M.D. or D.O. (preferred) physician letter of recommendation.
UNECOM: Letter of recommendation from an osteopathic physician is highly recommended
TCOM: Letter from an osteopathic physician is strongly encouraged.
VCOM: Completed evaluation form or letter (on letterhead accompanied by a release)
from an osteopathic physician THIS IS REQUIRED
COMP:
Letter of recommendation from a physician, preferably a D.O.
WVSOM:
Letters of recommendation from an osteopathic physician and from a premedical advisor, a premedical advisory committee, or an approved basic science faculty member.