Mahmood El-gasim, MD
Mahmood El-gasim, MD is an Uveitis and Ocular Inflammatory Disease (Ophthalmology) Physician in Phoenix, AZ, registered under NPI 1477814739. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty. 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 4800 N 22ND ST, Phoenix, AZ 85016. 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 |
|---|---|---|
| 53975 | AZ | Uveitis and Ocular Inflammatory Disease… primary |
| 53975 | AZ | Ophthalmology Physician |
| 53975 | AZ | Retina Specialist (Ophthalmology)… |
This provider holds licence 53975 issued in AZ. 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 - Ophthalmology
- PAC ID
- 5294011524
- Enrollment ID
- I20170420001986
Medicare enrolment is recorded as approved under the provider type Practitioner - 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 Uveitis and Ocular Inflammatory Disease covers
An ophthalmologist who specializes in the treatment of intraocular inflammation, scleritis, keratitis and infectious disorders affecting the eye and inflammatory disorders of the adnexa and/or orbit. NUCC Health Care Provider Taxonomy, code 207WX0108X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207WX0108X | Uveitis and Ocular Inflammatory Disease (Ophthalmology) Physician Uveitis and Ocular Inflammatory Disease | 53975 | AZ | primary |
| 207W00000X | Ophthalmology Physician | 53975 | AZ | |
| 207WX0107X | Retina Specialist (Ophthalmology) Physician Retina Specialist | 53975 | AZ |
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 | 1477814739 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 4, 2012 |
| Last updated | May 7, 2019 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | MD |
| Practice address |
4800 N 22ND ST Phoenix, AZ 85016 (602) 955-1000 Fax (602) 508-4830 |
| Other identifiers |
254851
· Medicaid (AZ) |
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 | 4 | 7 | 7 | 8 | 1 | 4 | 7 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 5 | 7 | 7 | 1 | 8 | 7 | 6 |
Sum = 71 · next multiple of 10 = 80 · check digit = 9 · actual last digit = 9
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.