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DR. MARK CHUNG-HSUN TSAI M.D.
NPI 1225033111
Internal Medicine in Paramount, CA

Active since June 16, 2005PECOS EnrolledAccepts Medicare AssignmentCLIA 05D2008077 · Microscopy
16415 COLORADO AVE, SUITE 101, PARAMOUNT, CA 90723(562) 634-6341(562) 634-8949 Get Directions Write a Review

NPPES record last updated: April 3, 2017. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Mark Chung-hsun Tsai M.d. NPPES

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

DR. MARK CHUNG-HSUN TSAI M.D. (NPI 1225033111) is an individual internal medicine provider in Paramount, California, licensed in California (A81875) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, holds a CLIA Microscopy certificate valid through June 2, 2028, and is a graduate of University Of Pittsburgh School Of Medicine (2001).

NPPES Registry Identity

NPI1225033111
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. MARK CHUNG-HSUN TSAICredential: M.D.
Location Address16415 COLORADO AVE, SUITE 101Paramount, CA 90723-5035
Mailing Address16415 Colorado Ave, Suite 101Paramount, CA 90723-5035 · (562) 634-6341 · Fax (562) 634-8949
Phone(562) 634-6341
Fax(562) 634-8949
Sole ProprietorYes
Medical School CMSUniversity Of Pittsburgh School Of MedicineGraduated 2001
Enumeration DateJune 16, 2005
Last NPPES UpdateApril 3, 2017
✔ NPI 1225033111 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A81875
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
16415 COLORADO AVE, Paramount, CA 90723
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Other Identifiers 1

OtherA81875CA · California License

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. Mark Chung-hsun Tsai M.d. 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 ID5092741694
PECOS Enrollment IDI20050714000918
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.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 05D2008077

Mark Tsai MD · Paramount, CA
Active · expires Jun 2, 2028
CLIA Number05D2008077
Laboratory TypePhysician Office
Certificate Effective DateJune 3, 2026
Certificate Expiration DateJune 2, 2028
Laboratory DirectorMark C. Tsai
Laboratory Phone(562) 634-6341
Laboratory LocationMark Tsai MD16415 South Colorado Suite 101, Paramount, CA 90723
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

Areas of Expertise CMS Part B claims 8

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
401 services167 patients
Brief communication technology-based service, e.g. virtual check-in, by a physician or other qualified health care professional who can report evaluation and management services, provided to an established patient, not originating from a related e/m servic G2012
A virtual check-in is a short online or phone consultation with your healthcare provider. It's for established patients and isn't related to a recent appointment. It's a convenient way to discuss health concerns without needing to visit the office in person.
223 services93 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
142 services74 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
68 services68 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
64 services63 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
24 services21 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90723 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

Referred Medical Equipment & Supplies CMS DME claims 6

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
19 suppliers77 claims137 services$4.40 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
14 suppliers40 claims41 services$0.61 avg. paid by Medicare
Enteral feeding supply kit; syringe fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4034
Other-Enteral and Parenteral · category OB006N
1 supplier12 claims360 services$2.43 avg. paid by Medicare
Enteral formula, nutritionally complete, calorically dense (equal to or greater than 1.5 kcal/ml) with intact nutrients, includes proteins, fats, carbohydrates, vitamins and minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4152
Other-Enteral and Parenteral · category OB006N
1 supplier12 claims5,124 services$0.25 avg. paid by Medicare
Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier12 claims12 services$11.12 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers14 claims14 services$52.74 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 14

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

GREGORY J. SZAL, M.D., INC.
Clinic/Center (Medical Specialty)
16415 COLORADO AVE, SUITE 408
PARAMOUNT, CA 90723
Los Angeles County (562) 531-9423
DR. ANH HONG PHAM D.O.
Internal Medicine
16415 COLORADO AVE
PARAMOUNT, CA 90723
Los Angeles County (562) 602-2334
MA. MILDRED R. REY, M.D.
Pediatrics
16415 COLORADO AVE, STE 308
PARAMOUNT, CA 90723
Los Angeles County (562) 630-5581
MING-YI YEN M D A PROFESSIONAL CORPORATION
Obstetrics & Gynecology
16415 COLORADO AVE, STE 301
PARAMOUNT, CA 90723
Los Angeles County (562) 633-2512
JAYCEELYN GUZMAN DELACRUZ
Nurse Practitioner
16415 COLORADO AVE, SUITE 207
PARAMOUNT, CA 90723
Los Angeles County (562) 602-2334
JOSE LUIS DE LA ROSA M.D.
Obstetrics & Gynecology
16415 COLORADO AVE, SUITE 103
PARAMOUNT, CA 90723
Los Angeles County (562) 531-0733
DR. KOUNG Y CHEN M.D.
General Practice
16415 COLORADO AVE, SUITE 101
PARAMOUNT, CA 90723
Los Angeles County (562) 634-6341
MOHAMMAD ISMAIL MD
Internal Medicine (Nephrology)
16415 COLORADO AVE, SUITE 207
PARAMOUNT, CA 90723
Los Angeles County (562) 602-2334

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 Mark Tsai's NPI number?

The NPI number for Mark Tsai is 1225033111. It was assigned to this individual provider in the NPPES registry on June 16, 2005.

Where is Mark Tsai located?

Mark Tsai practices at 16415 Colorado Ave Suite 101, Paramount, CA 90723. The listed phone number is (562) 634-6341.

What is Mark Tsai's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mark Tsai enrolled in Medicare?

Yes. Mark Tsai 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.

Does Mark Tsai hold a CLIA laboratory certificate?

Yes. A Certificate for Provider-Performed Microscopy Procedures (PPMP) (number 05D2008077) is associated with this NPI, valid through June 2, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Mark Tsai was last updated on April 3, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.