MARK K CHANG (M.D.) – Orthopaedic Surgery Physician, NPI 1871607507
Orthopaedic Surgery Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
668 ORTHOPEDIC SURGERY in IN
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Provider Addresses for MARK K CHANG (M.D.)
Joliet Street, Dyer, Lake County, Indiana, 46311, United States
STE 104
DYER, IN 463111996
Phone: (219) 836-4955
Fax: (219) 865-2377
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 33 Open Payments records for all available years, with a total value of $64,988.
Total Amount is formed as General ($64,988) + Research ($0) + Ownership ($0) = $64,988.
Last reported payment date: 2024-11-01 • Largest payer in this snapshot: Medyssey USA, Inc ($64,000).
Total Amount
$64,988
General + Research + Ownership
Payments
33
Total payment records
General Amount
$64,988
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-01
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Medyssey USA, Inc | $64,000 |
| Abbott Laboratories | $814 |
| Medtronic, Inc. | $53 |
| Carlsmed, Inc. | $43 |
| Arteriocyte Medical Systems, Inc. | $38 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2007-07-02
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20050404000169 | I | Orthopedic Surgery | IL | TBD |
| I20070702000136 | I | Orthopedic Surgery | IN | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99212 | Established patient office or other outpatient visit, 10-19 minutes | 608 | 282 | $0 |
| 72100 | X-ray of lower and sacral spine, 2-3 views | 329 | 173 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 159 | 139 | $0 |
| 99441 | Telephone medical discussion with physician, 5-10 minutes | 118 | 49 | $0 |
| 99202 | New patient office or other outpatient visit, 15-29 minutes | 107 | 107 | $0 |
Insurance plans in this area (ZIP 46311)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| ORTHOPEDIC SURGERY | IN | 63048 | Partial removal of spine bone with release of spinal cord and/or nerves | 89 | 53 |
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