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DR. MARY ELLEN CHANG DO
NPI 1649891987
Emergency Medicine in San Antonio, TX

Active since April 28, 2020PECOS EnrolledAccepts Medicare Assignment
7703 FLOYD CURL DR # 7736, SAN ANTONIO, TX 78229(210) 567-4621 Get Directions Write a Review

NPPES record last updated: July 8, 2022. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Mary Ellen Chang Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARY ELLEN CHANG DO (NPI 1649891987) is an individual emergency medicine provider in San Antonio, Texas, licensed in Texas (T7889) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS, is affiliated with Baylor University Medical Center, and is a graduate of Other (2020).

NPPES Registry Identity

NPI1649891987
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameDR. MARY ELLEN CHANGCredential: DO
Location Address7703 FLOYD CURL DR # 7736San Antonio, TX 78229-3901
Mailing Address21630 Milsa Dr Apt 2302San Antonio, TX 78256-2502
Phone(210) 567-4621
Sole ProprietorNo
Medical School CMSOtherGraduated 2020
Enumeration DateApril 28, 2020
Last NPPES UpdateJuly 8, 2022
NPPES CertifiedJuly 8, 2022
✔ NPI 1649891987 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in TX · T7889
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License BP10070592 (TX)
7703 FLOYD CURL DR # 7736, San Antonio, TX 78229
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Other Names 1

Other Name (5)Dr. Molly Chang Do

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mary Ellen Chang Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5698156974
PECOS Enrollment IDI20220718002476, I20251030004866
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
179 services177 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
156 services140 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
68 services67 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
47 services44 patients
Electrocardiogram (ecg) 1 to 3 leads with review by physician only 93042
An Electrocardiogram (ECG) is a non-invasive test that records the electrical activity of your heart. 1 to 3 leads or sensors are placed on your body to capture this data. A physician then reviews the results to evaluate your heart's health.
21 services21 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Baylor University Medical Center

Acute Care Hospitals · Dallas, TX
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number450021
Location3500 Gaston AveDallas, TX 75246 · Dallas County
Emergency services Birthing friendly

Baylor Scott & White Medical Center - Round Rock

Acute Care Hospitals · Round Rock, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number670034
Location300 University BlvdRound Rock, TX 78664 · Williamson County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78229 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$84.92 typical visit price
range $54.84 – $166.88
Typical copayment $21.23 (range $13.71 – $41.72)
Most-billed visit code 99203
Established Patient
$97.05 typical visit price
range $17.52 – $136.11
Typical copayment $24.26 (range $4.38 – $34.02)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NICOLAS ANDREW LAPUMA DO
Emergency Medicine
7703 FLOYD CURL DR # 7736
SAN ANTONIO, TX 78229
Bexar County (210) 567-4621
ANGELA NICOLE NEWTON WAGUESPACK
Emergency Medicine
7703 FLOYD CURL DR # 7736
SAN ANTONIO, TX 78229
Bexar County (210) 567-4621

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary Ellen Chang's NPI number?

The NPI number for Mary Ellen Chang is 1649891987. It was assigned to this individual provider in the NPPES registry on April 28, 2020. The provider is also known as Dr. Molly Chang Do.

Where is Mary Ellen Chang located?

Mary Ellen Chang practices at 7703 Floyd Curl Dr # 7736, San Antonio, TX 78229. The listed phone number is (210) 567-4621.

What is Mary Ellen Chang's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Mary Ellen Chang enrolled in Medicare?

Yes. Mary Ellen Chang is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Mary Ellen Chang accept?

Health plans from Blue Cross and Blue Shield of Texas and Oscar Insurance Company list Mary Ellen Chang as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mary Ellen Chang affiliated with any hospitals?

According to CMS data, Mary Ellen Chang is affiliated with Baylor University Medical Center and Baylor Scott & White Medical Center - Round Rock.

When was this NPI record last updated?

The NPPES record for Mary Ellen Chang was last updated on July 8, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.