Richard Dwyer, M.D., ED.D.
Richard Dwyer, M.D., ED.D. is a Psychiatry Physician in Washington, DC, registered under NPI 1023148772. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 2401 E STREET NW L217, Washington, DC 20520. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 00016639 | SD | Psychiatry Physician primary |
| 00016639 | SD | Forensic Psychiatry Physician |
| 00016639 | SD | Child & Adolescent Psychiatry Physician |
This provider holds licence 00016639 issued in SD. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Psychiatry covers
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems. NUCC Health Care Provider Taxonomy, code 2084P0800X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2084P0800X | Psychiatry Physician Psychiatry | 00016639 | SD | primary |
| 2084F0202X | Forensic Psychiatry Physician Forensic Psychiatry | 00016639 | SD | |
| 2084P0804X | Child & Adolescent Psychiatry Physician Child & Adolescent Psychiatry | 00016639 | SD |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1023148772 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 6, 2007 |
| Last updated | Oct 18, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D., ED.D. |
| Practice address |
2401 E STREET NW L217 Washington, DC 20520 (202) 663-1901 |
| Mailing address |
519 W 22ND ST STE 100 Sioux Falls, SD 57105 |
| Other identifiers |
232162
· Medicaid (SC) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 2 | 3 | 1 | 4 | 8 | 7 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 4 | 3 | 2 | 4 | 7 | 7 | 5 |
Sum = 58 · next multiple of 10 = 60 · check digit = 2 · actual last digit = 2
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.