Mark Walker, FNP-C
Mark Walker, FNP-C is a Family Nurse Practitioner in Boston, MA, registered under NPI 1003330028. 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 Boston, based on OpenStreetMap data collected Aug 28, 2026. Parking is available about 996 ft away at Main Garage. There is EV charging 0.31 mi from the office (ChargePoint) — useful if you are driving in from out of town. The nearest transit stop is 476 ft away, served by Longwood Ave @ Blackfan St. A pharmacy sits 0.27 mi from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.29 mi away.
Getting here and what is nearby
Transit Ave Louis Pasteur @ Longwood Ave 160 ft ~1 min
Transit Ave Louis Pasteur @ Longwood Ave 279 ft ~2 min
Parking Boston Latin School Side Parking Lot 252 ft ~1 min
78 Avenue Louis Pasteur, Boston 02115
Transit Longwood Ave @ Blackfan St 476 ft ~2 min
Coffee Starbucks 543 ft ~3 min
283 Longwood Avenue, Boston 02115
Mo-Fr 05:30-20:00; Sa-Su 06:00-19:00
Parking 784 ft ~3 min
45 Avenue Louis Pasteur
Parking Main Garage 996 ft ~4 min
340 Brookline Avenue
Coffee Starbucks 0.20 mi ~5 min
364 Brookline Avenue, Boston 02115
Mo-Fr 05:30-20:00
Hotel Inn at Longwood Medical 0.20 mi ~4 min
Restaurant Dunkin' 0.21 mi ~5 min
330 Brookline Avenue, Boston 02215
Mo-Tu 06:00-16:00; We 06:00-14:00; Th-Fr 06:00-16:00; Sa-Su 00:00-24:00
Convenience 7-Eleven 0.23 mi ~5 min
Restaurant Dunkin' 0.23 mi ~5 min
1631 Tremont Street, Boston 02120
Mo-Sa 05:00-20:00; Su 06:00-20:00
Restaurant Dunkin' 0.24 mi ~5 min
350 Longwood Avenue, Boston 02115
Mo-Fr 06:00-18:00; Sa-Su 06:00-16:00
Convenience Food Mart 0.25 mi ~6 min
Gas station Shell 0.25 mi ~6 min
1600 Tremont Street
Pharmacy CVS Pharmacy 0.25 mi ~5 min
350 Longwood Avenue, Boston 02115
Mo-Fr 06:30-22:00; Sa-Su 08:00-22:00
Pharmacy Walgreens 0.27 mi ~6 min
Grocery Stop & Shop 0.27 mi ~6 min
1620 Tremont Street, Boston 02120
Mo-Su 07:00-22:00
Coffee Caffè Nero 0.29 mi ~6 min
EV charging ChargePoint 0.31 mi ~7 min
Grocery Star Market 0.46 mi ~10 min
33 Kilmarnock Street, Boston 02215
Mo-Su 06:00-23:00
Convenience 7-Eleven 0.48 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 |
|---|---|---|
| RN279876 | MA | Family Nurse Practitioner primary |
| RN279876 | MA | Registered Nurse |
This provider holds licence RN279876 issued in MA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Nurse Practitioner
- PAC ID
- 6709143944
- Enrollment ID
- I20171127001825
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. 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.
What Family covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LF0000X
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 | |
|---|---|---|---|---|
| 363LF0000X | Family Nurse Practitioner Family | RN279876 | MA | primary |
| 163W00000X | Registered Nurse | RN279876 | MA |
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 | 1003330028 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 1, 2017 |
| Last updated | Jul 25, 2023 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | FNP-C |
| Practice address |
75 FRANCIS ST Boston, MA 02115 (617) 732-5000 |
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 | 3 | 0 | 0 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 3 | 0 | 0 | 4 |
Sum = 42 · next multiple of 10 = 50 · check digit = 8 · actual last digit = 8
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.