Sean Grossarth, PSA, CDCA-P, RA
Sean Grossarth, PSA, CDCA-P, RA is a Peer Specialist in Lancaster, OH, registered under NPI 1003318734. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty. 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 Lancaster, based on OpenStreetMap data collected Sep 18, 2026. Parking is available about 202 ft away. There is EV charging 424 ft from the office (ChargePoint) — useful if you are driving in from out of town. The nearest transit stop is 621 ft away. A pharmacy sits 615 ft from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.20 mi away.
Getting here and what is nearby
Transit 102 ft ~1 min
Parking 103 ft ~1 min
Parking 197 ft ~1 min
Parking 202 ft ~1 min
Transit 253 ft ~1 min
EV charging ChargePoint 424 ft ~2 min
Restaurant Downtown Fruit Passion 595 ft ~3 min
Transit 621 ft ~3 min
Pharmacy CVS Pharmacy 615 ft ~3 min
Restaurant Bob's Backyard Barbecue 638 ft ~3 min
Restaurant Ale House 1890 664 ft ~3 min
149 West Main Street, Lancaster 43130
Mo-Sa 16:00-23:00; Fr-Sa 16:00-24:00
Coffee L-City Coffee 0.20 mi ~5 min
Mo-Th 06:00-18:00; Fr 06:00-19:00; Sa 07:00-19:00; Su 08:00-16:00
Gas station Lancaster Marathon 0.38 mi ~8 min
602 Lincoln Avenue, Lancaster 43130
Gas station Speedway 0.48 mi ~10 min
Gas station Speedway 0.49 mi ~10 min
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 |
|---|---|---|
| 00435 | OH | Peer Specialist primary |
| RA.161611 | OH | Prevention Professional |
| CDCA.166229 | OH | Addiction (Substance Use Disorder)… |
This provider holds licence 00435 issued in OH. 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 Peer Specialist covers
Individuals certified to perform peer support services through a training process defined by a government agency, such as the Department of Veterans Affairs or a state mental health department/certification/licensing authority. NUCC Health Care Provider Taxonomy, code 175T00000X
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 | |
|---|---|---|---|---|
| 175T00000X | Peer Specialist | 00435 | OH | primary |
| 405300000X | Prevention Professional | RA.161611 | OH | |
| 101YA0400X | Addiction (Substance Use Disorder) Counselor Addiction (Substance Use Disorder) | CDCA.166229 | OH |
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 | 1003318734 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 8, 2018 |
| Last updated | Mar 8, 2018 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | PSA, CDCA-P, RA |
| Practice address |
201 S COLUMBUS ST Lancaster, OH 43130 (740) 687-4500 Fax (740) 687-4595 |
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 | 3 | 1 | 8 | 7 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 1 | 7 | 7 | 6 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.