Nathaniel Schaffer, MD, PHD
Nathaniel Schaffer, MD, PHD is an Orthopaedic Trauma Physician in Denver, CO, registered under NPI 1679001747. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 777 BANNOCK ST, Denver, CO 80204. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 0075582 | CO | Orthopaedic Trauma Physician primary |
| 4301112013 | MI | Orthopaedic Surgery Physician |
| 65391 | TN | Orthopaedic Trauma Physician |
| MD61443193 | WA | Orthopaedic Trauma Physician |
Licences are recorded in 4 states: CO, MI, TN, WA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Orthopedic Surgery
- PAC ID
- 5193086304
Medicare enrolment is recorded as approved under the provider type Practitioner - Orthopedic Surgery. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 4 states
This provider holds licences in 4 states: Colorado, Michigan, Tennessee and Washington. The practice address on file is in Denver, CO, 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
- 0075582
- Specialty
- Orthopaedic Trauma 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 Orthopaedic Trauma covers
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, orthopaedic trauma surgeons deal with the evaluation and management of acute orthopaedic injuries, evaluation and treatment of post-traumatic deformities and nonunions, acute and delayed reconstruction of pelvic and acetabular fractures, as well as osteotomy in the adult hip for treatment of hip arthritis. NUCC Health Care Provider Taxonomy, code 207XX0801X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207XX0801X | Orthopaedic Trauma Physician Orthopaedic Trauma | 0075582 | CO | primary |
| 207X00000X | Orthopaedic Surgery Physician | 4301112013 | MI | |
| 207XX0801X | Orthopaedic Trauma Physician Orthopaedic Trauma | 65391 | TN | |
| 207XX0801X | Orthopaedic Trauma Physician Orthopaedic Trauma | MD61443193 | WA |
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 | 1679001747 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 1, 2017 |
| Last updated | Aug 20, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD, PHD |
| Practice address |
777 BANNOCK ST Denver, CO 80204 (303) 436-4949 |
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 | 6 | 7 | 9 | 0 | 0 | 1 | 7 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 5 | 9 | 0 | 0 | 2 | 7 | 8 |
Sum = 63 · next multiple of 10 = 70 · check digit = 7 · actual last digit = 7
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.