MARK K CHANG MD
MARK K CHANG MD is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003022476, based in Dyer, IN. It is classified under Orthopaedic Surgery of the Spine Physician.
Getting there
The practice address on file is 1100 JOLIET ST STE 104, Dyer, IN 46311. 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 |
|---|---|---|
| 036095817 | IL | Orthopaedic Surgery of the Spine Physician primary |
This provider holds licence 036095817 issued in IL. 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 - Orthopedic/orthopedic Surgery
- PAC ID
- 0547369613
Medicare enrolment is recorded as approved under the provider type Dme Supplier - Physician - Orthopedic/orthopedic Surgery. 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 Orthopaedic Surgery of the Spine covers
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, orthopaedic surgeons of the spine deal with the evaluation and nonoperative and operative treatment of the full spectrum of primary spinal disorders including trauma, degenerative, deformity, tumor, and reconstructive. NUCC Health Care Provider Taxonomy, code 207XS0117X
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 | 1003022476 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | May 15, 2007 |
| Last updated | Jan 13, 2015 |
| Status | Active |
| Practice address |
1100 JOLIET ST STE 104 Dyer, IN 46311 (219) 836-4955 Fax (219) 865-2377 |
| Other identifiers |
200868870A
(IN) DG1633 · RR MEDICARE (IL) |
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 | 0 | 0 | 3 | 0 | 2 | 2 | 4 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 2 | 4 | 4 | 5 |
Sum = 44 · next multiple of 10 = 50 · 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.