Michael O'brien, PA
Michael O'brien, PA is a Physician Assistant in Florence, MA, registered under NPI 1922625185. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 70 ACREBROOK DR, Florence, MA 01062. 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 |
|---|---|---|
| PA100930 | MA | Physician Assistant primary |
| PA200001682 | DC | Physician Assistant |
| 031368 | NY | Physician Assistant |
| 085010117 | IL | Physician Assistant |
| 123128 | IA | Physician Assistant |
| 5601012132 | MI | Physician Assistant |
| 2023043567 | MO | Physician Assistant |
| C08887 | MD | Physician Assistant |
| 7143 | CT | Physician Assistant |
| PA58546 | CA | Physician Assistant |
Licences are recorded in 10 states: MA, DC, NY, IL, IA, MI, MO, MD, CT, CA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Physician Assistant
- PAC ID
- 5799105276
Enrolled in Medicare 8 times, across 8 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| California | I20201022000896 | Practitioner - Physician Assistant |
| Maryland | I20230816003317 | Practitioner - Physician Assistant |
| District of Columbia | I20230816003417 | Practitioner - Physician Assistant |
| Missouri | I20240207002279 | Practitioner - Physician Assistant |
| Iowa | I20240719002434 | Practitioner - Physician Assistant |
| New York | I20240916000233 | Practitioner - Physician Assistant |
| Connecticut | I20250618002328 | Practitioner - Physician Assistant |
| Massachusetts | I20250809000163 | Practitioner - Physician Assistant |
Medicare enrolment is recorded as approved under the provider type Practitioner - Physician Assistant. There are 8 separate enrolment records across 8 states (CA, MD, DC, MO, IA, NY, CT, MA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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 10 states
This provider holds licences in 10 states: California, Connecticut, District of Columbia, Iowa, Illinois, Massachusetts, Maryland, Michigan, Missouri and New York. The practice address on file is in Florence, MA, 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
- PA100930
- Specialty
- Physician Assistant
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 Physician Assistant covers
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician. NUCC Health Care Provider Taxonomy, code 363A00000X
All registered taxonomy codes
This provider registers 10 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 363A00000X | Physician Assistant | PA100930 | MA | primary |
| 363A00000X | Physician Assistant | PA200001682 | DC | |
| 363A00000X | Physician Assistant | 031368 | NY | |
| 363A00000X | Physician Assistant | 085010117 | IL | |
| 363A00000X | Physician Assistant | 123128 | IA | |
| 363A00000X | Physician Assistant | 5601012132 | MI | |
| 363A00000X | Physician Assistant | 2023043567 | MO | |
| 363A00000X | Physician Assistant | C08887 | MD | |
| 363A00000X | Physician Assistant | 7143 | CT | |
| 363A00000X | Physician Assistant | PA58546 | CA |
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 | 1922625185 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 2, 2020 |
| Last updated | Sep 10, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | PA |
| Practice address |
70 ACREBROOK DR Florence, MA 01062 (413) 210-8823 |
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 | 9 | 2 | 2 | 6 | 2 | 5 | 1 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 4 | 2 | 3 | 2 | 1 | 1 | 7 |
Sum = 55 · next multiple of 10 = 60 · check digit = 5 · actual last digit = 5
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.