Joel Merkwan, PH.D.
Joel Merkwan, PH.D. is a Clinical Psychologist in Yankton, SD, registered under NPI 1699810879.
Getting there
The practice address on file is 327 BROADWAY AVE STE 15, Yankton, SD 57078. 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 |
|---|---|---|
| 393 | ND | Clinical Psychologist primary |
| 490 | SD | Clinical Psychologist |
Licences are recorded in 2 states: ND, SD. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Clinical Psychologist
- PAC ID
- 7618070889
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| South Dakota | I20100831000699 | Practitioner - Clinical Psychologist |
| Alaska | I20250430002421 | Practitioner - Clinical Psychologist |
Medicare enrolment is recorded as approved under the provider type Practitioner - Clinical Psychologist. There are 2 separate enrolment records across 2 states (SD, AK). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: North Dakota and South Dakota. The practice address on file is in Yankton, SD, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 490
- Specialty
- Clinical Psychologist
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Clinical covers
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems. NUCC Health Care Provider Taxonomy, code 103TC0700X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103TC0700X | Clinical Psychologist Clinical | 393 | ND | primary |
| 103TC0700X | Clinical Psychologist Clinical | 490 | 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 | 1699810879 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 21, 2007 |
| Last updated | Jun 29, 2010 |
| Status | Active |
| Sole proprietor | No |
| Credential | PH.D. |
| Practice address |
327 BROADWAY AVE STE 15 Yankton, SD 57078 (605) 661-6128 |
| Mailing address |
2505 ABBOTT DR Yankton, SD 57078 |
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 | 6 | 9 | 9 | 8 | 1 | 0 | 8 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 9 | 9 | 7 | 1 | 0 | 8 | 5 |
Sum = 71 · next multiple of 10 = 80 · check digit = 9 · actual last digit = 9
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.