Johanna Chang, M.D.
Johanna Chang, M.D. is a Pediatric Rheumatology Physician in San Diego, CA, registered under NPI 1821242199. 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 8110 BIRMINGHAM WAY BLDG 28, San Diego, CA 92123. 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 |
|---|---|---|
| A98479 | CA | Pediatric Rheumatology Physician primary |
| A98479 | CA | Pediatrics Physician |
This provider holds licence A98479 issued in CA. 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 - Pediatric Medicine
- PAC ID
- 0143491464
- Enrollment ID
- I20110919000267
Medicare enrolment is recorded as approved under the provider type Practitioner - Pediatric Medicine. 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 Pediatric Rheumatology covers
A pediatrician who treats diseases of joints, muscle, bones and tendons. A pediatric rheumatologist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and "collagen" diseases. NUCC Health Care Provider Taxonomy, code 2080P0216X
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 | |
|---|---|---|---|---|
| 2080P0216X | Pediatric Rheumatology Physician Pediatric Rheumatology | A98479 | CA | primary |
| 208000000X | Pediatrics Physician | A98479 | 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 | 1821242199 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 12, 2008 |
| Last updated | Nov 17, 2011 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
8110 BIRMINGHAM WAY BLDG 28 San Diego, CA 92123 (858) 966-8082 Fax (858) 966-6791 |
| Mailing address |
3860 CALLE FORTUNADA STE #210 San Diego, CA 92123 |
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 | 8 | 2 | 1 | 2 | 4 | 2 | 1 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 4 | 1 | 4 | 4 | 4 | 1 | 9 |
Sum = 61 · next multiple of 10 = 70 · 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.