Mahmoud Kallash, MD
Mahmoud Kallash, MD is a Pediatric Nephrology Physician in Columbus, OH, registered under NPI 1396935508. 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 555 S 18TH ST, Columbus, OH 43205. 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 |
|---|---|---|
| 35-131055 | OH | Pediatric Nephrology Physician primary |
| 35-131055 | OH | Pediatrics Physician |
This provider holds licence 35-131055 issued in OH. 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 - Nephrology
- PAC ID
- 4789827395
Medicare enrolment is recorded as approved under the provider type Practitioner - Nephrology. 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.
What Pediatric Nephrology covers
A pediatrician who deals with the normal and abnormal development and maturation of the kidney and urinary tract, the mechanisms by which the kidney can be damaged, the evaluation and treatment of renal diseases, fluid and electrolyte abnormalities, hypertension and renal replacement therapy. NUCC Health Care Provider Taxonomy, code 2080P0210X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2080P0210X | Pediatric Nephrology Physician Pediatric Nephrology | 35-131055 | OH | primary |
| 208000000X | Pediatrics Physician | 35-131055 | OH |
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 | 1396935508 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 25, 2007 |
| Last updated | Feb 20, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
555 S 18TH ST Columbus, OH 43205 (614) 722-6200 |
| Mailing address |
700 CHILDRENS DR Columbus, OH 43205 |
| Other identifiers |
0218203
(OH) H589820 · MEDICARE-CGS (OH) |
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 | 3 | 9 | 6 | 9 | 3 | 5 | 5 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 3 | 9 | 6 | 9 | 3 | 1 | 5 | 0 |
Sum = 62 · next multiple of 10 = 70 · check digit = 8 · actual last digit = 8
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.