Allen Chao
Nephrology Physician · Pasadena, CA
Allen Chao is a nephrology physician with a practice address in Pasadena, California, and NPI 1952765034, issued on Apr 5, 2016. Check the license (California A154990, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allen Chao
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A154990 CA
Self-reported in NPPES; status is on the state search - Practice location
- 50 Alessandro PL Ste 250, Pasadena, CA 91105
- Phone
- (626) 577-1675
- Enumerated
- Apr 5, 2016
- Record last updated
- Jul 30, 2026
- Fax
- (626) 577-9115
- Medicaid ID
- AC3232267556 CA
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 50 Alessandro PL Ste 250
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Matthew Kim, DONephrology Physician1700319837
- Michael Linsey, M.D.Nephrology Physician1841215217
- Ann Moore, MDNephrology Physician1750506630
- Ka-Lok Tse, M.D.Nephrology Physician1093730491
Verify Allen Chao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A154990Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average nephrology physician in 2024
916 Medicare Part D claims for 152 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Jardiance118 claims
- Spironolactone65 claims
- Olmesartan Medoxomil63 claims
- Amlodipine Besylate62 claims
- Lokelma36 claims
- Irbesartan34 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 74.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $22.91
1 payment: food and beverage; the largest payer was Otsuka America Pharmaceutical, Inc. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Allen Chao among 1,468 nephrology physician records in California
Allen Chao is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 89% of them.
- NPI issued2016 · 89% of these records are older, 9% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileNo · 77% of these records are
- Record last updated2026 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Pasadena → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Syeda Ali, MDPasadena, CA 911051528051984
- Justin Chen, MDPasadena, CA 911051447526066
- Muhammad Iqbal, M.D.Pasadena, CA 911051578515896
- Matthew Kim, DOPasadena, CA 911051700319837
- Michael Linsey, M.D.Pasadena, CA 911051841215217
- Ilian Marquez, M.D.Pasadena, CA 911051710019906
- Ann Moore, MDPasadena, CA 911051750506630
- Ashok Sunder Raj, M.D.Pasadena, CA 911051093744070
Common questions
What is Allen Chao's NPI number?
Allen Chao's National Provider Identifier (NPI) is 1952765034, issued on Apr 5, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Allen Chao located?
The NPPES record lists a practice address at 50 Alessandro PL Ste 250, Pasadena, CA, 91105. Phone: (626) 577-1675. Providers update this record themselves, so call before visiting.
How can I verify Allen Chao's license?
NPPES lists California license number A154990, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Allen Chao prescribe under Medicare Part D?
In 2024, Allen Chao had 916 Medicare Part D claims for 152 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
What is Allen Chao's MIPS final score?
The 2023 MIPS final score is 74.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.