The DM medical abbreviation almost always means diabetes mellitus, the condition in which blood sugar, or glucose, runs higher than normal because the body makes too little insulin, uses it poorly, or both. If you were looking for the medical abbreviation for diabetes, DM is the one you will see most in charts.
The same two letters have a few other medical meanings, such as dermatomyositis in rheumatology and dextromethorphan on cough medicine labels, so context matters. This page covers what diabetes mellitus means, how its types are written, the lab numbers often charted beside it, plus clues for spotting the other meanings. So what is DM medical abbreviation shorthand most likely to mean in your own record? Diabetes, in nearly every case.
At a glance
Stands for
Diabetes mellitusOther meanings
Dermatomyositis (a muscle and skin disease); dextromethorphan (a cough suppressant)Word roots
Diabetes, Greek for passing through; mellitus, Latin for sweet like honeyWritten as
DM, DM1, DM2, T1DM, T2DM, GDMOlder terms
Where you see it
Problem lists, history sections, referral letters, care plansKey labs
A1c, fasting glucose (FBS)
DM medical abbreviation meaning: diabetes mellitus
Diabetes mellitus is a long term condition in which glucose builds up in the blood. Insulin, a hormone made by the pancreas, normally moves glucose from the blood into cells for energy. When insulin is missing or the body resists it, glucose stays in the bloodstream. Over years, high glucose can damage the eyes, kidneys, nerves, heart and blood vessels.
The name has an old story built in. The first word traces to an ancient Greek term for a siphon, since people with untreated diabetes pass a lot of urine. Mellitus is Latin for honey sweet, describing the sugar in that urine. The second word separated it from diabetes insipidus, a different and unrelated condition about water balance.
Types of diabetes and how they are written
| Shorthand | Meaning | Main feature |
|---|---|---|
| DM1, T1DM | Type 1 diabetes | The immune system destroys insulin making cells; insulin is required |
| DM2, T2DM | Type 2 diabetes | Insulin resistance plus reduced insulin output; the most common type |
| GDM | Gestational diabetes | High glucose first found in pregnancy |
| IDDM and NIDDM | Insulin dependent and non insulin dependent diabetes | Older terms now mostly replaced by type 1 and type 2 |
Notes may also add a word on control, such as "DM2, uncontrolled" or "DM2 with hyperglycemia," or list complications like neuropathy or kidney disease right after the diagnosis.
Reading DM in a chart line
Clinic note: "PMH: DM type 2, on metformin. A1c 7.4 percent last month. Feet: monofilament sensation intact." The patient has type 2 diabetes and takes metformin by mouth. The A1c is a blood test that reflects average glucose over roughly the past three months. The foot check looks for nerve changes from diabetes. The medicine and values are examples of format only.
Hospital order: "Glucose checks AC and HS, insulin sliding scale." Fingerstick glucose is tested before meals and at bedtime, and insulin is adjusted by the reading.
Before meals is written AC. Many patients today also use a CGM, a continuous glucose monitor, and notes may quote its readings.
Common lab numbers charted with diabetes
Diabetes is usually diagnosed with blood tests. In the United States, commonly used thresholds for adults are:
| Test | Prediabetes range | Diabetes range |
|---|---|---|
| A1c | About 5.7 to 6.4 percent | 6.5 percent or higher |
| Fasting glucose | About 100 to 125 mg/dL | 126 mg/dL or higher |
| 2 hour glucose tolerance test | About 140 to 199 mg/dL | 200 mg/dL or higher |
A diagnosis usually needs a repeat test or more than one abnormal result. Labs set their own reference ranges, and personal targets for someone already diagnosed are set with their clinician.
Other meanings of DM and how to tell
- Dermatomyositis: an inflammatory disease of muscles and skin, causing weakness and a typical rash. Rheumatology and neurology notes may write DM this way, often next to muscle enzyme results.
- Dextromethorphan: a cough suppressant. The letters DM in a cough syrup name usually signal that it is included.
In a general medical or primary care chart, DM means diabetes unless the note clearly concerns muscles or a cough remedy. When there is doubt, the writer can confirm, and spelling out the condition removes the guesswork.
Frequently asked questions
Which abbreviation do charts use for diabetes?
The usual abbreviation is DM, short for diabetes mellitus. The type is often added, as in DM1 or DM2, or written as T1DM and T2DM.
What does DM2 mean?
DM2 means type 2 diabetes mellitus, the most common form. It involves insulin resistance along with a gradual drop in insulin production.
Does DM always mean diabetes?
No. In rheumatology it can mean dermatomyositis, and on cough medicine labels it stands for dextromethorphan. In most general medical notes, though, DM means diabetes mellitus.
What does mellitus mean?
Mellitus is Latin for sweet like honey. Early physicians noticed that untreated diabetes made the urine taste sweet.
What is the difference between DM and diabetes insipidus?
Diabetes mellitus is about high blood sugar. Diabetes insipidus is a separate condition in which the body cannot hold on to water properly, causing large amounts of dilute urine, with normal blood sugar.