The MDD medical abbreviation stands for major depressive disorder, the formal clinical name for what many people call clinical depression. It is a recognized medical condition involving a low mood or loss of interest that lasts at least two weeks and affects daily life, and it is among the most common diagnoses in primary care and mental health records.
Patients often see MDD on an after-visit summary, a referral or a patient portal problem list, sometimes followed by extra words such as single episode, recurrent, mild or severe. Those words are not random. They are standard descriptors that help other clinicians understand the pattern. This page explains what the letters and the add-on words mean, how MDD differs from related terms, and why it so often sits next to GAD.
At a glance
Stands for
Major depressive disorderPlain name
Clinical depression or major depressionWritten as
MDD; plural MDDs is rare and informalCommon add-ons
Single episode or recurrent; mild, moderate or severe; in remissionSpecialty
Psychiatry, psychology, primary careOften paired with
GAD, generalized anxiety disorderDo not confuse with
MDE (major depressive episode) and PDD (persistent depressive disorder)
What the MDD medical abbreviation describes
Major depressive disorder is diagnosed when a person has a cluster of symptoms nearly every day for at least two weeks, and one of them is either a depressed mood or a marked loss of interest or pleasure in usual activities. Other symptoms in the cluster include changes in sleep or appetite, low energy, trouble concentrating, slowed thinking or restlessness, feelings of worthlessness or guilt, and thoughts of death.
The word major does not mean the most severe form. It separates this diagnosis from shorter or milder low moods and from long-running but lower grade depression. A clinician makes the diagnosis after talking with the person, ruling out other causes such as thyroid problems or medicine side effects, and often using a questionnaire.
Specifiers that follow MDD on a chart
The words after the abbreviation narrow down the picture. They are part of the formal diagnosis and also matter for coding.
| Descriptor | What it tells the reader |
|---|---|
| Single episode | This is the first known period of major depression |
| Recurrent | There has been at least one earlier episode |
| Mild, moderate, severe | How strong the current symptoms are and how much they limit daily life |
| In partial or full remission | Symptoms have eased partly or completely |
| With anxious distress | Marked tension or worry is part of the current episode |
On a portal problem list: "MDD, recurrent, in partial remission." This tells the reader the person has had more than one episode, and current symptoms are better but not fully gone.
Scores and screening tools near MDD
Notes often show a number next to the diagnosis. The most common is a PHQ-9 score from a nine-question form about the past two weeks. Totals run from 0 to 27, and higher numbers suggest more symptoms. In general terms, scores around 5, 10, 15 and 20 are used as rough markers for mild, moderate, moderately severe and severe ranges. A shorter two-question version, the PHQ-2, is often used first as a quick screen.
A score alone does not make the diagnosis. It helps track change from one visit to the next, so you may see a line like "PHQ-9 down from 18 to 9," which shows improvement over time.
How MDD fits into treatment notes
Treatment lines vary from person to person. Common elements include talk therapy, such as cognitive behavioral therapy, and antidepressant medicines written by generic name, for example sertraline, fluoxetine or bupropion. Notes may also mention sleep, exercise, social support and follow-up timing. A line such as "continue current regimen, RTC 6 weeks" means keep the same plan and return to clinic in about six weeks; see RTC for that shorthand.
Clinicians also record a safety screen at many visits. You may see "denies SI," meaning the person reported no thoughts of suicide. The SI abbreviation page explains that term.
In the US, the 988 Suicide and Crisis Lifeline can be reached by call or text at 988.
For students and scribes charting depression
MDD is a standard, accepted abbreviation, but the specifiers carry real weight. Coders need the episode type and the severity to assign the right code, so "depression" alone or "MDD" alone is less complete. Writing the full phrase once, then MDD afterward, keeps a referral clear.
Use neutral, clinical wording. Phrases like "reports low mood for three weeks" or "endorses anhedonia" record what the person said without judgment. For other diagnosis shorthand, open the conditions and diagnoses list.
This explains chart language only. Anyone with questions about their own mood, a diagnosis or a medicine should speak with their primary care clinician, therapist or psychiatrist.
Frequently asked questions
What does MDD stand for in medical terms?
MDD stands for major depressive disorder, often called clinical depression. It is diagnosed when a low mood or loss of interest, plus other symptoms, lasts at least two weeks and affects daily life.
What does MDD recurrent mean?
Recurrent means the person has had more than one episode of major depression. A first episode is written as single episode instead.
What does GAD and MDD mean together?
GAD is generalized anxiety disorder and MDD is major depressive disorder. They often occur together, so clinicians list both when both are present.
Is MDD the same as depression?
MDD is the formal name for major or clinical depression. The everyday word depression can also describe shorter low moods or other depressive conditions, so MDD is more specific.
Is MDD a medical acronym or an abbreviation?
It is an initialism, a type of abbreviation said letter by letter as M-D-D. People often call it an acronym in casual speech.