Justin Grammy, DO
Justin Grammy, DO is a Hospitalist Physician in San Luis Obispo, CA, registered under NPI 1003254483. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in San Luis Obispo, based on OpenStreetMap data collected Sep 14, 2026. Parking is available about 0.51 mi away. The nearest transit stop is 0.38 mi away, served by Monterey & Grand. If you arrive early, there is a coffee shop 0.28 mi away.
Getting here and what is nearby
Parking 137 ft ~1 min
Parking 199 ft ~1 min
Coffee Outspoken Cafe 0.20 mi ~5 min
Restaurant Frank's Famous Hot Dogs 0.20 mi ~4 min
950 California
Restaurant Ziggy's 0.21 mi ~5 min
594 California Boulevard, San Luis Obispo 93405
Mo-Su 11:00-21:00
Restaurant Poke Chef 0.21 mi ~5 min
580 California Boulevard, San Luis Obispo 93405
Mo-Sa 11:00-21:00; Su 11:30-21:00
Hotel Petit Soleil, Bed and Breakfast 0.23 mi ~5 min
Coffee Alma Cafe 0.24 mi ~5 min
1531 Monterey Street
Hotel Lamplighter Inn & Suites 0.24 mi ~5 min
1616 Monterey
Hotel Sunbeam Motel 0.26 mi ~6 min
1656 Monterey
Convenience 7-Eleven 0.27 mi ~6 min
1301 Monterey Street, San Luis Obispo 93401
24/7
Coffee Kaffein Coffee Company 0.28 mi ~6 min
Convenience 7-Eleven 0.28 mi ~6 min
552 California Boulevard, San Luis Obispo 93405-1905
Convenience Slo Asian Market 0.29 mi ~6 min
Transit Grand & Wilson 0.31 mi ~7 min
Gas station University Gas 0.31 mi ~7 min
Transit Grand & Abbott 0.34 mi ~7 min
Transit Monterey & Grand 0.38 mi ~8 min
Gas station Speedway Express 0.41 mi ~9 min
Gas station Conserv Fuel 0.44 mi ~9 min
Grocery Smart & Final Extra! 0.45 mi ~10 min
Parking 0.51 mi ~11 min
919 Palm Street
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 |
|---|---|---|
| OS018634 | PA | Internal Medicine Physician |
| 16620 | CA | Internal Medicine Physician |
| 16620 | CA | Hospitalist Physician primary |
Licences are recorded in 2 states: PA, CA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 3274804752
- Enrollment ID
- I20180901000074
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. 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: California and Pennsylvania. The practice address on file is in San Luis Obispo, CA, 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
- 16620
- Specialty
- Internal Medicine Physician
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 Hospitalist covers
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients. NUCC Health Care Provider Taxonomy, code 208M00000X
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 | |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | OS018634 | PA | |
| 207R00000X | Internal Medicine Physician | 16620 | CA | |
| 208M00000X | Hospitalist Physician | 16620 | CA | primary |
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 | 1003254483 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 7, 2013 |
| Last updated | Nov 17, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | DO |
| Practice address |
1428 PHILLIPS LN STE 203 San Luis Obispo, CA 93401 (805) 543-4407 Fax (805) 543-4587 |
| Mailing address |
PO BOX 12460 San Luis Obispo, CA 93406 |
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 | 2 | 5 | 4 | 4 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 5 | 8 | 4 | 7 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.