D/O and DO Do Not Mean the Same Thing in Medical Writing
d/o or D/O is used in some clinical and psychiatric writing as shorthand for disorder, as in “anxiety d/o.” By contrast, DO or D.O. after a clinician’s name means Doctor of Osteopathic Medicine, a U.S. physician degree.
The slash, capitalization, placement, and surrounding words matter. A note that says “mood d/o” and a name written “Jordan Lee, DO” are describing completely different things.
Look at how the letters are written
Independent terminology guide: Medical-Terms.org is not a medical school, licensing board, physician directory, hospital, or government health agency. This page explains terminology; it does not verify an individual clinician’s license, specialty, board certification, or diagnosis.
What does D/O mean in medical terms?
When written d/o or D/O inside a clinical phrase, it can mean “disorder.” Peer-reviewed psychiatric literature explicitly defines d/o as disorder and uses forms such as “mood d/o” and “anxiety d/o.” When DO or D.O. follows a person’s name, it means Doctor of Osteopathic Medicine, the formal U.S. physician degree recognized by the American Osteopathic Association, MedlinePlus, AACOM, and the AMA.
Abbreviation safety: neither form should be expanded from the letters alone when the context is unclear. The Joint Commission requires healthcare organizations to standardize terminology and abbreviations because shorthand can be ambiguous.
When d/o means disorder
Lowercase or slashed d/o appears in some clinical and research writing as an informal abbreviation for disorder. NCBI-hosted peer-reviewed articles explicitly define “d/o” or “D/O” as disorder in their abbreviation notes and use it in psychiatric phrases such as mood d/o, anxiety d/o, personality d/o, and bipolar d/o.
“Anxiety d/o”
This commonly reads as anxiety disorder when it appears in a psychiatric diagnosis list, study table, or clinical note.
“Mood d/o”
In psychiatric shorthand this commonly means mood disorder. The surrounding diagnosis wording should still be read because modern diagnostic names can be more specific.
“Seizure d/o”
In informal chart shorthand this may be read as seizure disorder, but the actual diagnosis should be confirmed from the full problem-list or assessment text.
Important limitation: d/o is shorthand, not a universal formal coding term. A clinician, hospital, research paper, or specialty can follow its own abbreviation conventions. If a diagnosis matters to your care, use the full diagnosis name rather than relying on d/o alone.
What does DO mean after a doctor’s name?
In the United States, DO stands for Doctor of Osteopathic Medicine. A name written as “Taylor Morgan, DO” indicates that the physician earned a Doctor of Osteopathic Medicine degree. MedlinePlus states that a DO is a physician licensed to practice medicine, perform surgery, and prescribe medicine.
The American Osteopathic Association says the proper name of the degree is Doctor of Osteopathic Medicine and that DO may also be used in place of “osteopathic physician.” Current AOA terminology specifically advises against expanding the modern U.S. degree as “Doctor of Osteopathy.”
What DO does not tell you: the credential alone does not identify the physician’s specialty, board-certification status, hospital privileges, current license status, or whether that clinician is the right specialist for a particular medical problem.
DO vs MD: what is the difference?
The United States has two medical degrees that lead to physician practice: MD (Doctor of Medicine) and DO (Doctor of Osteopathic Medicine). The AMA says the two pathways have largely similar medical-school structures, and both lead to physician practice after required postgraduate training and licensure.
| Question | DO | MD |
|---|---|---|
| Full degree name | Doctor of Osteopathic Medicine | Doctor of Medicine |
| Physician in the U.S.? | Yes | Yes |
| Medical school | Osteopathic medical school | MD-granting medical school, often called allopathic |
| Residency | Completes graduate medical education/residency | Completes graduate medical education/residency |
| Can specialize? | Yes, across medical and surgical specialties | Yes, across medical and surgical specialties |
| Distinctive training | Additional osteopathic principles and manipulative medicine training | Does not follow the osteopathic OMM curriculum |
Useful distinction: a DO is not a lower-level or alternative nonphysician credential in the United States. AOA, AMA, AACOM, and MedlinePlus all describe DOs as physicians who can practice across medical specialties.
How a Doctor of Osteopathic Medicine is trained
AACOM and AOA describe DO education as four years of osteopathic medical school followed by postgraduate specialty training. Osteopathic medical curricula include biomedical and clinical sciences, clinical rotations, preventive medicine, and additional instruction in osteopathic principles and osteopathic manipulative medicine.
Osteopathic medical school
Students complete a four-year program at a college of osteopathic medicine. The degree awarded at graduation is Doctor of Osteopathic Medicine (DO).
Clinical education
Training includes rotations in core medical and surgical areas. AACOM notes that osteopathic medical education covers fields such as internal medicine, family medicine, pediatrics, surgery, psychiatry, obstetrics/gynecology, radiology, preventive medicine, and public health.
Residency and possible fellowship
After medical school, DO graduates complete residency training and may pursue fellowship training. MD and DO graduates now train within the same ACGME graduate medical education accreditation system.
Licensure examinations
NBOME describes COMLEX-USA as the examination pathway for osteopathic physician licensure. It has Level 1, Level 2-CE, and Level 3, completed in sequence across medical school and residency.
State licensure and board certification
AOA notes that physicians are licensed by state medical boards and may pursue board certification in a medical specialty or subspecialty. Exact licensure requirements vary by state.
Osteopathic physician, DO, osteopath, and “Doctor of Osteopathy” are not interchangeable
The AOA recommends osteopathic physician for a fully licensed U.S. physician who graduated from an accredited osteopathic medical school. It identifies Doctor of Osteopathic Medicine as the proper degree name represented by DO.
AOA guidance distinguishes U.S. osteopathic physicians from osteopaths trained outside the United States, who may follow different education and licensing systems and may not qualify for unrestricted physician licensure. For that reason, this article uses “osteopathic physician” rather than treating “osteopath” as an automatic synonym for a U.S. DO.
Preferred U.S. wording
- Doctor of Osteopathic Medicine
- DO or D.O.
- Osteopathic physician
- Osteopathic medicine
Use with caution
- “Doctor of Osteopathy” — appears in older sources and thesauri, but AOA says it is not the proper modern U.S. degree name.
- “Osteopath” — can refer to differently trained non-U.S. practitioners.
How to tell what D/O or DO means in a record
| What you see | Most likely meaning | Why |
|---|---|---|
| “Generalized anxiety d/o” | Disorder | d/o is embedded inside a diagnosis phrase. |
| “Jordan Lee, DO” | Doctor of Osteopathic Medicine | DO follows a clinician’s name as a professional credential. |
| “MD and DO physicians” | Doctor of Osteopathic Medicine | The text is comparing the two U.S. physician degree pathways. |
| “Bipolar D/O” | Disorder | Peer-reviewed psychiatric writing has used D/O this way. |
| Only “DO” with no surrounding words | Unclear | Capitalization alone is not enough; local shorthand can vary. |
Check punctuation and capitalization
Slashed d/o inside a diagnosis phrase points toward disorder. Capital DO or D.O. after a person’s name points toward the physician degree.
Identify what the abbreviation is attached to
If it modifies anxiety, mood, seizure, or another diagnosis term, “disorder” may fit. If it follows a provider name, the degree meaning is much more likely.
Use the document’s own terminology
Healthcare organizations may maintain local abbreviation lists. A formal provider directory or credentialing page is more reliable for a clinician’s degree than an isolated chart abbreviation.
Confirm personal records when the meaning affects care
If the shorthand changes how you understand a diagnosis, medication instruction, referral, or clinician credential, ask the organization that created the record rather than guessing.
Why D/O should not be interpreted without the full line
The Joint Commission does not publish a universal list of “approved” medical abbreviations. Instead, accredited organizations are expected to standardize terminology and maintain prohibited abbreviations where ambiguity could create risk.
That matters here because d/o and DO can refer to different concepts, and other local uses may exist. A terminology page can show common, verified meanings, but it cannot replace the notation rules of the hospital, clinic, medical school, or research publication where the abbreviation appears.
Do not change treatment from an abbreviation definition. If D/O appears beside a medication, diagnosis, procedure, or discharge instruction and its meaning is not obvious from the complete sentence, confirm it with the relevant healthcare professional.
Authoritative sources used for this D/O and DO definition
D/O and DO medical abbreviation FAQs
What does D/O mean in a medical chart?
When written as d/o or D/O inside a diagnosis phrase, it can mean disorder. Peer-reviewed medical literature uses forms such as mood d/o and anxiety d/o. The full sentence should still be checked because abbreviation practices vary.
What does DO mean after a doctor’s name?
DO after a clinician’s name means Doctor of Osteopathic Medicine in the United States. It is a physician degree, not an abbreviation for disorder in that context.
Is a DO a real physician?
Yes. MedlinePlus, AOA, AACOM, and AMA describe Doctors of Osteopathic Medicine as physicians. They attend medical school, complete postgraduate medical training, obtain state licensure, and may practice in medical and surgical specialties.
Can a DO prescribe medicine and perform surgery?
Yes. MedlinePlus states that doctors of osteopathic medicine are licensed physicians who can practice medicine, perform surgery, and prescribe medicine, subject to the same kinds of state licensure and professional requirements that apply to physician practice.
What is the difference between a DO and an MD?
DO means Doctor of Osteopathic Medicine and MD means Doctor of Medicine. Both are U.S. physician degree pathways. DO education additionally includes osteopathic principles and manipulative medicine training.
Is “Doctor of Osteopathy” the correct expansion of DO?
The current American Osteopathic Association says the proper U.S. degree name is Doctor of Osteopathic Medicine. “Doctor of Osteopathy” appears in older terminology and reference records but is not the preferred modern degree name.
Is a DO the same as an osteopath?
Not always. In current U.S. usage, the AOA recommends “osteopathic physician” for a DO. It uses “osteopath” for differently trained practitioners outside the United States who may not qualify for unrestricted physician licensure.
What does “anxiety d/o” mean?
In psychiatric or clinical shorthand, “anxiety d/o” commonly means anxiety disorder. For a personal medical record, use the complete diagnosis wording and ask the record source if the shorthand is unclear.
What exams do DO students take?
NBOME administers COMLEX-USA for osteopathic medical licensure. The sequence includes Level 1, Level 2-CE, and Level 3. DO students may also take USMLE in some circumstances, but COMLEX-USA is the osteopathic licensure examination pathway.
How should I interpret D/O if the record gives no context?
Do not guess from the letters alone. Check punctuation, capitalization, placement, document type, and nearby words. If more than one meaning fits and the abbreviation affects your understanding of care, ask the healthcare organization or professional who created the record.
How this D/O medical abbreviation page was refreshed
The previous article did not provide a concrete primary definition and instead repeated generic advice that D/o could vary by context. This refresh preserves the useful context-and-safety principle but replaces the thin wording with two verified meanings: d/o as disorder in clinical shorthand and DO/D.O. as Doctor of Osteopathic Medicine when used as a U.S. physician credential.
It also adds the practical DO-vs-MD comparison, current AOA terminology, osteopathic medical education and licensing context, MeSH identification for osteopathic physicians, source-specific examples, and a clear method for interpreting ambiguous personal records. Reviewed October 11, 2026.