ALEXANDER CHANG MD PC
ALEXANDER CHANG MD PC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1275719536, based in Pittsburgh, PA. It is classified under Eyewear Supplier.
Getting there
The practice address on file is 2101 GREENTREE RD SUITE 105, Pittsburgh, PA 15220. 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 |
|---|---|---|
| 80677158 | PA | Eyewear Supplier primary |
This provider holds licence 80677158 issued in PA. 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
- Dme Supplier - Physician - Ophthalmology
- PAC ID
- 2961481759
- Enrollment ID
- O20100930002063
Medicare enrolment is recorded as approved under the provider type Dme Supplier - Physician - Ophthalmology. 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 Eyewear Supplier covers
An organization that provides spectacles, contact lenses, and other vision enhancement devices prescribed by an optometrist or ophthalmologist. NUCC Health Care Provider Taxonomy, code 332H00000X
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1275719536 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Jan 17, 2008 |
| Last updated | Mar 12, 2008 |
| Status | Active |
| Practice address |
2101 GREENTREE RD SUITE 105 Pittsburgh, PA 15220 (412) 429-2020 Fax (412) 429-0932 |
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 | 2 | 7 | 5 | 7 | 1 | 9 | 5 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 5 | 5 | 5 | 1 | 9 | 5 | 6 |
Sum = 64 · next multiple of 10 = 70 · check digit = 6 · actual last digit = 6
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.