Mark Duke, LCSW
Mark Duke, LCSW is a provider specialising in Clinical Social Worker in Salt Lake City, UT, registered under NPI 1003035429. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Salt Lake City, based on OpenStreetMap data collected Aug 31, 2026. Parking is available about 0.42 mi away. There is EV charging 0.24 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 477 ft away, served by 200 South / State Street (WB). A pharmacy sits 910 ft from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 700 ft away.
Getting here and what is nearby
Transit State Street / 150 South (SB) 164 ft ~1 min
Parking 168 ft ~1 min
Transit State Street / 150 South (NB) 227 ft ~1 min
Parking Regent Street Parking Garage 248 ft ~1 min
Restaurant Chinese Bistro 285 ft ~2 min
133 South Regent Street, Salt Lake City
Restaurant Honest Eatery 303 ft ~2 min
115 South Regent Street, Salt Lake City 84111
Mo-Fr 08:00-19:00; Sa 09:00-18:00; Su 09:00-15:00
Restaurant Maize 306 ft ~2 min
151 South Regent Street, Salt Lake City 84111
Mo 11:00-15:00; Tu-Sa 11:30-19:00
Convenience Maverik 371 ft ~2 min
185 South State Street, Salt Lake City 84111
Mo-Sa 05:00-22:00; Su off
Transit 200 South / State Street (WB) 477 ft ~2 min
Coffee Alpha Cafe 545 ft ~3 min
111 South Main Street, Salt Lake City 84101
EV charging 656 ft ~3 min
Coffee Three Pines Coffee 661 ft ~3 min
165 South Main Street, Salt Lake City
Mo-Fr 07:00-17:00; Sa,Su 08:00-17:00
Coffee Vitality Bowls 700 ft ~3 min
51 South Main Street, Salt Lake City 84102
Mo-Sa 09:00-20:00
Grocery Harmons 674 ft ~3 min
135 East 100 South, Salt Lake City 84111
Mo-Su 06:00-22:00
Hotel Salt Lake City Marriott City Center 725 ft ~3 min
Hotel The Belvedere 835 ft ~4 min
29 South State Street, Salt Lake City 84111
Pharmacy Walgreens 910 ft ~4 min
72 South Main Street, Salt Lake City 84101
Mo-Fr 10:00-18:00; Mo-Fr 13:30-14:00 off; Sa,Su off
Hotel Kimpton Hotel Monaco Salt Lake City 0.20 mi ~4 min
EV charging 0.24 mi ~5 min
Convenience Market On Main Street 0.25 mi ~5 min
268 South Main Street, Salt Lake City 84101
Gas station Sinclair 0.34 mi ~7 min
Parking 0.42 mi ~9 min
215 South 200 West, Salt Lake City 84101
Convenience 7-Eleven 0.50 mi ~10 min
Gas station 7-Eleven 0.50 mi ~11 min
309 East 400 South, Salt Lake City 84111
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 369885-3501 | UT | Clinical Social Worker primary |
This provider holds licence 369885-3501 issued in UT. 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 Clinical covers
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances. NUCC Health Care Provider Taxonomy, code 1041C0700X
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 | 1003035429 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 24, 2007 |
| Last updated | Jul 8, 2007 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | LCSW |
| Practice address |
132 SOUTH STATE SUITE 200 Salt Lake City, UT 84111 (801) 240-3556 |
| Mailing address |
11471 HIGH MOUNTAIN DR Sandy, UT 84092 |
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 | 0 | 3 | 0 | 3 | 5 | 4 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 3 | 1 | 4 | 4 |
Sum = 41 · next multiple of 10 = 50 · 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.