Physician Profile
Unclaimed ProfileAbout CHANG
Based in West Nyac, NY, Mark Chang, M.D. is listed in the NPI registry under urology. Mark graduated from Jefferson Medical College of Thomas Jefferson University in 1999. According to Medicare claims data, Mark cared for 3,304 Medicare patients across 5,208 services.
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
- (845) 354-5000
- Email not available
Practice Locations
2 MEDICAL PARK DR.
West Nyac, NY 10994
Procedures Most Often Billed to Medicare
5,208 services · 3,304 patients · 14 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Ultrasound measurement of bladder capacity after voiding | Procedure | 51798 |
1,105 |
| Simple insertion of temporary bladder tube | Procedure | 51702 |
183 |
| Diagnostic exam of bladder and urethra using an endoscope | Procedure | 52000 |
115 |
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
69 |
| Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient' | Billing code | G2211 |
1,252 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
819 |
| Automated urinalysis test | Lab test | 81003 |
776 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
554 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
109 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
75 |
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.
Trained at Jefferson Medical College of Thomas Jefferson University 8
Other providers in the same specialty who trained at the same institution.
Class of 1999 at Jefferson Medical College of Thomas Jefferson University 8
Providers who graduated from the same medical school in the same year.
Also performs Ultrasound measurement of bladder capacity after voiding 8
Providers in NY who bill this service to Medicare most often.
Common questions
What does Dr. Chang specialize in?
Dr. Chang is an urology in West Nyac, NY. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “UROLOGY”.
NPI registry
Where is Dr. Chang located?
Dr. Chang is listed at 2 MEDICAL PARK DR., West Nyac, NY 10994. 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 (845) 354-5000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Chang's NPI number?
Dr. Chang's National Provider Identifier is 1356564934. 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 Jefferson Medical College of Thomas Jefferson University, graduating in 1999. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Chang been practicing?
Dr. Chang has 27 years experience. Calculated from a graduation year of 1999, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Chang do most often?
According to Medicare billing data, Dr. Chang performs procedures including ultrasound measurement of bladder capacity after voiding, simple insertion of temporary bladder tube and diagnostic exam of bladder and urethra using an endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Chang confirmed this information?
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.