Mark Chang, M.D.
NPI 1871607507 · Orthopaedic Surgery Physician · Dyer, IN
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Chang, M.D. is a Orthopaedic Surgery Physician provider in Dyer, IN (NPI 1871607507).
Provider details
- NPI number
- 1871607507
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 200033540A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,677 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 441 | $52 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 285 | $83 |
| X-Ray of Lower and Sacral Spine, 2-3 Views72100 | 276 | $36 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 104 | $35 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 78 | $101 |
| X-Ray of Upper Spine, 2-3 Views72040 | 70 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 880 | 202 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 399 | 62 |
| Tramadol Hcl | 216 | 63 |
| Gabapentin | 193 | 48 |
| Methylprednisolone | 181 | 111 |
| Diazepam | 125 | 40 |
| Cyclobenzaprine Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$32,717 across 20 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-19
- Last updated
- 2025-02-05
- Certified
- 2025-02-05
Frequently asked questions
- What is Mark Chang's NPI number?
- Mark Chang's National Provider Identifier (NPI) is 1871607507, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Chang's specialty?
- Mark Chang is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Chang located?
- Mark Chang's practice location on file with NPPES is 1100 Joliet St, Dyer, IN 46311-1996.
- What is Mark Chang's phone number?
- The practice phone number listed in the NPPES registry for Mark Chang is (219) 836-4955.
- Does Mark Chang accept Medicare?
- Mark Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Chang's NPI active?
- Yes — Mark Chang's NPI (1871607507) is active in the NPPES registry as of the last update on 2025-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.