Johnny Chang, M.D.
Johnny Chang, M.D. is an Urology Physician in Middletown, CT, registered under NPI 1619975182. 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 410 SAYBROOK RD, Middletown, CT 06457. 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 |
|---|---|---|
| 041177 | CT | Urology Physician primary |
| 041177 | CT | Specialist |
This provider holds licence 041177 issued in CT. 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 - Urology
- PAC ID
- 6608974340
Medicare enrolment is recorded as approved under the provider type Practitioner - Urology. 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 Urology covers
A urologist manages benign and malignant medical and surgical disorders of the genitourinary system and the adrenal gland. This specialist has comprehensive knowledge of and skills in endoscopic, percutaneous and open surgery of congenital and acquired conditions of the urinary and reproductive systems and their contiguous structures. NUCC Health Care Provider Taxonomy, code 208800000X
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 | |
|---|---|---|---|---|
| 208800000X | Urology Physician | 041177 | CT | primary |
| 174400000X | Specialist | 041177 | CT |
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 | 1619975182 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 8, 2005 |
| Last updated | May 5, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
410 SAYBROOK RD Middletown, CT 06457 (860) 358-2270 Fax (860) 358-2275 |
| Mailing address |
28 CRESCENT ST Middletown, CT 06457 |
| Other identifiers |
0000231610801
· UNITED HEALTHCARE ID (CT) 1411777 (CT) 3159551 · AETNA PROVIDER ID (CT) 041177 · CONNECTICARE PROVIDER ID (CT) 2V4421 · HEALTHNET PROVIDER ID (CT) 00141177700 · BLUE CARE FAMILY PLAN ID (CT) 010041177CT01 · BLUE SHIELD PROVIDER ID (CT) P2882366 · OXFORD PROVIDER ID (CT) |
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 | 6 | 1 | 9 | 9 | 7 | 5 | 1 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 2 | 9 | 9 | 7 | 1 | 1 | 7 |
Sum = 68 · next multiple of 10 = 70 · check digit = 2 · actual last digit = 2
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.