Physician Profile
Unclaimed ProfileAbout CHANG
Mark Wan Soo Chang, MD is a healthcare provider in Johnson City, TN specializing in cardiovascular disease (cardiology). Mark trained at Columbia University College of Physicians and Surgeons, graduating in 1987. Mark is also listed as specializing in interventional cardiology and cardiovascular disease. Medicare claims data shows Mark provided 649 services to 578 patients.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (423) 282-5054
- Email not available
Practice Locations
2428 KNOB CREEK ROAD
Johnson City, TN 37604
Procedures Most Often Billed to Medicare
649 services · 578 patients · 11 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
187 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
142 |
| Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist | Treatment | 93458 |
22 |
| Heart rhythm review, and interpretation of continous external ekg over more than 48 hours up to 7 days | Treatment | 93244 |
18 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
136 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
38 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
34 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
22 |
| Telephone medical discussion with physician, 11-20 minutes | Office visit | 99442 |
21 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
17 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other cardiovascular diseases at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 5
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 31 related providers in 4 groups
Other cardiovascular diseases in Johnson City 8
Same specialty, same city.
Trained at Columbia University College of Physicians and Surgeons 8
Other providers in the same specialty who trained at the same institution.
Class of 1987 at Columbia University College of Physicians and Surgeons 7
Providers who graduated from the same medical school in the same year.
Also performs Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 8
Providers in TN who bill this service to Medicare most often.
Common questions
What does Dr. Chang specialize in?
Dr. Chang is a cardiovascular disease (cardiology) in Johnson City, TN. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CARDIOVASCULAR DISEASE (CARDIOLOGY)”.
NPI registry
Where is Dr. Chang located?
Dr. Chang is listed at 2428 KNOB CREEK ROAD, Johnson City, TN 37604. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Chang's phone number?
The number on file is (423) 282-5054. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Chang?
Dr. Chang's National Provider Identifier is 1174632475. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Chang go to medical school?
Dr. Chang attended Columbia University College of Physicians and Surgeons, graduating in 1987. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Chang have?
Dr. Chang has 39 years experience. Calculated from a graduation year of 1987, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Chang do most often?
According to Medicare billing data, Dr. Chang provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report and routine electrocardiogram using at least 12 leads with interpretation and report only, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Chang's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Chang. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.