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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.

ALLEN CHAO
NPI 1952765034
Internal Medicine - Nephrology in Pasadena, CA

Active since April 05, 2016PECOS EnrolledAccepts Medicare Assignment
74.46/100
CMS Quality Rating
50 ALESSANDRO PL STE 250, PASADENA, CA 91105(626) 577-1675(626) 577-9115 Get Directions Write a Review

NPPES record last updated: July 30, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 30, 2026, Oct 26, 2022 (2 updates tracked since 2022).

About Allen Chao NPPES

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

ALLEN CHAO (NPI 1952765034) is an individual nephrology provider in Pasadena, California, licensed in California (A154990) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS and is a graduate of Georgetown University School Of Medicine (2016).

NPPES Registry Identity

NPI1952765034
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameALLEN CHAO
Location Address50 ALESSANDRO PL STE 250Pasadena, CA 91105-4006
Mailing Address50 Alessandro Pl Ste 250Pasadena, CA 91105-4006 · (626) 577-1675 · Fax (626) 577-9115
Phone(626) 577-1675
Fax(626) 577-9115
Sole ProprietorNo
Medical School CMSGeorgetown University School Of MedicineGraduated 2016
Enumeration DateApril 5, 2016
Last NPPES UpdateJuly 30, 20262 updates tracked since enumeration
NPPES CertifiedJuly 30, 2026
✔ NPI 1952765034 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in CA · A154990
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
50 ALESSANDRO PL STE 250, Pasadena, CA 91105
Open in Google Maps ↗

Other Identifiers 1

MedicaidAC3232267556CA

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

Allen Chao 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 ID4385028372
PECOS Enrollment IDI20220824002968
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 10

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
240 services67 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
84 services65 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.
80 services60 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
79 services36 patients
Dialysis procedure including 1 evaluation 90945
Dialysis is a treatment that filters and purifies the blood when your kidneys can't do their job. The procedure involves circulating your blood through a machine that removes waste products. An evaluation is done beforehand to assess your health and determine the best approach for your treatment.
58 services21 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.
38 services37 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91105 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.

74.46/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Promoting Interoperability76
Improvement Activities40
Cost46.68

Other Providers at the Same Location NPPES 5

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

DR. KA-LOK E. TSE M.D.
Internal Medicine (Nephrology)
50 ALESSANDRO PL STE 250
PASADENA, CA 91105
Los Angeles County (626) 577-1675
MATTHEW KIM DO
Internal Medicine (Nephrology)
50 ALESSANDRO PL STE 250
PASADENA, CA 91105
Los Angeles County (626) 577-1675
DR. ANN MOORE MD
Internal Medicine (Nephrology)
50 ALESSANDRO PL STE 250
PASADENA, CA 91105
Los Angeles County (626) 577-1675
DR. MICHAEL S. LINSEY M.D.
Internal Medicine (Nephrology)
50 ALESSANDRO PL STE 250
PASADENA, CA 91105
Los Angeles County (626) 577-1675
PASADENA NEPHROLOGY CORPORATION A MEDICAL GROUP
Internal Medicine (Nephrology)
50 ALESSANDRO PL STE 250
PASADENA, CA 91105
Los Angeles County (626) 577-1675

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 Allen Chao's NPI number?

The NPI number for Allen Chao is 1952765034. It was assigned to this individual provider in the NPPES registry on April 5, 2016.

Where is Allen Chao located?

Allen Chao practices at 50 Alessandro Pl Ste 250, Pasadena, CA 91105. The listed phone number is (626) 577-1675.

What is Allen Chao's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Allen Chao enrolled in Medicare?

Yes. Allen Chao 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.

When was this NPI record last updated?

The NPPES record for Allen Chao was last updated on July 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 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.