Marco Mares-saihua
Marco Mares-saihua is a Pharmacist in Grayling, MI, registered under NPI 1003352923.
Getting there
Here is what surrounds this office in Grayling, based on OpenStreetMap data collected Sep 20, 2026. Parking is available about 164 ft away. There is EV charging 0.43 mi from the office — useful if you are driving in from out of town. A pharmacy sits 851 ft from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.48 mi away.
Getting here and what is nearby
Parking 129 ft ~1 min
Gas station Speedway 141 ft ~1 min
Parking 142 ft ~1 min
Parking 164 ft ~1 min
Convenience Speedway 215 ft ~1 min
308 South James Street, Grayling 49738
Convenience 7-Eleven 223 ft ~1 min
Restaurant Dairy Queen 227 ft ~1 min
Restaurant Subway 310 ft ~2 min
Restaurant Burger King 572 ft ~3 min
321 East State, Grayling 49738
Mo-Th 07:00-21:00; Fr-Sa 07:00-22:00; Su 07:00-21:00
Pharmacy Walgreens 851 ft ~4 min
Hotel Borchers Bed and Breakfast 0.27 mi ~6 min
EV charging 0.41 mi ~9 min
EV charging 0.43 mi ~9 min
Convenience Forward 0.47 mi ~10 min
503 North James Street, Grayling 49738
Coffee Starbucks 0.48 mi ~10 min
Gas station Shell 0.48 mi ~10 min
503 North James Street, Grayling 49738
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 |
|---|---|---|
| 5302035982 | MI | Pharmacist primary |
This provider holds licence 5302035982 issued in MI. 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 Pharmacist covers
An individual licensed by the appropriate state regulatory agency to engage in the practice of pharmacy. The practice of pharmacy includes, but is not limited to, assessment, interpretation, evaluation, and implementation, initiation, monitoring or modification of medication and or medical orders; the compounding or dispensing of medication and or medical orders; participation in drug and device procurement, storage, and selection; drug administration; drug regimen reviews; drug or drug-related research; provision of patient education and the provision of those acts or services necessary to provide medication therapy management services in all areas of patient care. NUCC Health Care Provider Taxonomy, code 183500000X
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 | 1003352923 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 17, 2017 |
| Last updated | Jan 17, 2017 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Practice address |
312 S JAMES ST Grayling, MI 49738 (989) 348-1350 |
| Mailing address |
82 JOSEPH RD Braintree, MA 02184 |
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 | 5 | 2 | 9 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 5 | 4 | 9 | 4 |
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.