The NIDDM medical abbreviation stands for non insulin dependent diabetes mellitus, which is the older name for what doctors now call type 2 diabetes. If you find it in a chart, it almost always means the person has type 2 diabetes, whether or not they take insulin today.
Major diabetes and health organizations stopped recommending the term decades ago, yet it lingers in long running problem lists, older referral letters, scanned records and the history notes copied forward from visit to visit. Readers who meet it in a parent's file or a coding class often wonder whether it signals a different disease. It does not. Below you will see how to translate it, why the name fell out of favor, and the modern shorthand that has taken its place, such as DM2.
At a glance
Stands for
Non insulin dependent diabetes mellitusModern name
Type 2 diabetes mellitus (T2DM, DM2, type 2 DM)Other old names
Adult onset diabetes, maturity onset diabetesOpposite term
IDDM, the old name for type 1 diabetesWhere you see it
Older problem lists, scanned records, copied history sectionsSafer to write
Type 2 diabetes mellitus, plus insulin use if relevant
Decoding the NIDDM medical abbreviation
Each letter has a plain meaning. Non insulin dependent means the body still makes some insulin, so a person does not need injected insulin simply to stay alive. Diabetes mellitus is the formal name for diabetes, the group of conditions in which blood sugar runs too high. Mellitus comes from a word meaning honey sweet, a nod to the sugar found in the urine of people with untreated diabetes.
In type 2 diabetes the body makes insulin but responds to it poorly, a pattern called insulin resistance, and over time the pancreas may make less of it. The condition is far more common than type 1 and is often linked to family history, age, body weight and activity level.
Why the name was dropped
The trouble with NIDDM is that it describes a treatment rather than the disease. Plenty of people with type 2 diabetes eventually need insulin to keep their blood sugar in range. Under the old system, a chart could end up saying a person had non insulin dependent diabetes while their medication list showed daily insulin, which confused patients, nurses and coders alike.
Expert groups therefore moved to type 1 and type 2, terms based on what is happening in the body. The DM page explains the wider family of diabetes shorthand. A person who started on pills and later added insulin still has type 2 diabetes; the label does not switch.
Old terms and their current equivalents
| You may read | Current wording |
|---|---|
| NIDDM | Type 2 diabetes mellitus |
| Adult onset diabetes | Type 2 diabetes mellitus |
| NIDDM on insulin, or insulin requiring NIDDM | Type 2 diabetes mellitus with long term insulin use |
| IDDM or juvenile diabetes | Type 1 diabetes mellitus |
The age based names were dropped for the same reason. Type 2 diabetes now appears in children and teenagers, and type 1 can begin in adulthood, so neither adult onset nor juvenile is reliable.
NIDDM in records and coding
In a transferred chart: "PMH: HTN, HLD, NIDDM." This reads as high blood pressure, high cholesterol and type 2 diabetes. HTN and HLD are common partners on the same line.
Coding and scribe trainees should map NIDDM to the type 2 diabetes category rather than looking for a separate code. If a note says NIDDM but shows insulin on the medication list, the usual approach is to code type 2 diabetes and add long term insulin use, and to query the provider when the type is genuinely unclear. Many facilities ask clinicians to update the problem list wording at the next visit so the old acronym stops being copied forward.
What it means if you find NIDDM in your own file
Seeing an outdated term does not mean anything is wrong with your care. It usually means the entry was made years ago or brought over from another system. Your current diagnosis, test results and treatment plan are what count. The most useful numbers to follow are usually the A1c, which reflects average blood sugar over about three months, and your home or sensor readings, with targets set by your care team.
This is general information about a medical term. Your diabetes care team can confirm which type of diabetes you have and help you correct an old label in your record if you would like.
Questions to bring to your next visit
- Which type of diabetes is listed in my chart today, and can old wording be updated?
- What A1c range is right for me?
- How often should my eyes, feet and kidneys be checked?
- If I ever need insulin, does that change my diagnosis? The usual answer is no, but it is worth hearing it from your own clinician.
Frequently asked questions
What does NIDDM stand for?
NIDDM stands for non insulin dependent diabetes mellitus. It is an older name for type 2 diabetes and is rarely chosen for new notes today.
Is NIDDM the same as type 2 diabetes?
Yes. When a chart says NIDDM, the writer meant type 2 diabetes. The newer name is preferred because many people with type 2 diabetes take insulin at some point.
Can a person with NIDDM use insulin?
Yes, and that was a key reason the term was retired. Needing insulin to manage blood sugar does not turn type 2 diabetes into type 1.
What replaced NIDDM in medical notes?
Clinicians now write type 2 diabetes mellitus, often shortened to T2DM, DM2 or type 2 DM. Coders map the old term to the type 2 diabetes category.