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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ALAN CHEN M.D.
NPI 1033539945
Internal Medicine - Gastroenterology in Torrance, CA

Active since April 17, 2014PECOS EnrolledAccepts Medicare Assignment
80.17/100
CMS Quality Rating
20911 EARL ST STE 220, TORRANCE, CA 90503(310) 214-7236(310) 542-0334 Get Directions Write a Review

NPPES record last updated: September 16, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 16, 2026, May 15, 2020, Jan 29, 2016 (3 updates tracked since 2016).

About Alan Chen M.d. NPPES

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

ALAN CHEN M.D. (NPI 1033539945) is an individual gastroenterology provider in Torrance, California, licensed in California (C207362) and active in the NPI registry since April 2014. He is enrolled in Medicare PECOS, is affiliated with Medstar Franklin Square Medical Center, and maintains a secondary practice location in Baltimore.

NPPES Registry Identity

NPI1033539945
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameALAN CHENCredential: M.D.
Location Address20911 EARL ST STE 220Torrance, CA 90503-4353
Mailing Address20911 Earl St Ste 220Torrance, CA 90503-4353 · (310) 214-7236 · Fax (310) 542-0334
Phone(310) 214-7236
Fax(310) 542-0334
Sole ProprietorNo
Medical School CMSDuke University School Of MedicineGraduated 2014
Enumeration DateApril 17, 2014
Last NPPES UpdateSeptember 16, 20263 updates tracked since enumeration
NPPES CertifiedSeptember 16, 2026
✔ NPI 1033539945 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Licenses✔ Licensed in CA · C207362✔ Licensed in MD · D0089536
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
20911 EARL ST STE 220, Torrance, CA 90503
Open in Google Maps ↗

Secondary Practice Location 1

Location 19000 Franklin Square DrBaltimore, MD 21237-3901 · Phone (443) 777-2475

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Alan Chen 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 ID8729309398
PECOS Enrollment IDI20200729001343
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.

Medicare Billing Reassignments

2

Medicare enrollment records show Alan Chen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Providence Medical Institute
0.2 mi
Family Medicine
4101 TORRANCE BLVD
Torrance, CA 90503
  • Reassigned Medicare billing, California enrollment
  • 266 clinicians in this Medicare group
NPI 1235182569 (310) 793-8075
Medstar Medical Group II LLC
2,310 mi
Internal Medicine
1145 19TH ST NW, SUITE 311
Washington, DC 20036
  • Reassigned Medicare billing, Maryland enrollment
  • 2,602 clinicians in this Medicare group
NPI 1376887844 (202) 429-2401

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 12

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 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.
104 services93 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
80 services80 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
80 services78 patients
Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385
This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.
75 services75 patients
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
63 services62 patients
Biopsy of large bowel using a flexible endoscope 45380
A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.
57 services57 patients

Hospital Affiliations CMS Care Compare

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

Medstar Franklin Square Medical Center

Acute Care Hospitals · Rosedale, MD
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number210015
Location9000 Franklin Square DriveRosedale, MD 21237 · Baltimore County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90503 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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

80.17/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality76.69
Promoting Interoperability100
Improvement Activities40
Cost53.49

Referred Medical Equipment & Supplies CMS DME claims 2

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

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 supplier13 claims390 services$2.42 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 supplier13 claims9,698 services$0.25 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 3

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

SUNNY MELENDEZ MD, INC.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
20911 EARL ST STE 220
TORRANCE, CA 90503
Los Angeles County (310) 542-7733
DR. KELSEY ELIZABETH COLLINS MD
Internal Medicine (Gastroenterology)
20911 EARL ST STE 220
TORRANCE, CA 90503
Los Angeles County (310) 214-7236
MRS. IRIS TAMASHIRO RN, WHNP
Nurse Practitioner (Women's Health)
20911 EARL ST STE 220
TORRANCE, CA 90503
Los Angeles County (310) 540-9600

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 Alan Chen's NPI number?

The NPI number for Alan Chen is 1033539945. It was assigned to this individual provider in the NPPES registry on April 17, 2014.

Where is Alan Chen located?

Alan Chen practices at 20911 Earl St Ste 220, Torrance, CA 90503. The listed phone number is (310) 214-7236.

What is Alan Chen's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Alan Chen enrolled in Medicare?

Yes. Alan Chen 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.

Which organizations bill Medicare for Alan Chen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alan Chen reassigns Medicare benefits to 2 organizations: Providence Medical Institute (Torrance, CA) and Medstar Medical Group II LLC (Washington, DC). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alan Chen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Alan Chen affiliated with any hospitals?

According to CMS data, Alan Chen is affiliated with Medstar Franklin Square Medical Center.

When was this NPI record last updated?

The NPPES record for Alan Chen was last updated on September 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 days 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.