NPPES file of Aug 9, 2026

Helen Heng-Shan Moon, M.D.

Hematology & Oncology Physician · Pasadena, CA

Helen Heng-Shan Moon, M.D. is a hematology & oncology physician with a practice address in Pasadena, California, and NPI 1255480075, issued on Jan 10, 2007. Check the license (California A91007, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1255480075
Name
Helen Heng-Shan Moon
Credential
M.D.
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
A91007 CA
Self-reported in NPPES; status is on the state search
Practice location
393 E Walnut St FL 3, Pasadena, CA 91188
Phone
(951) 353-4931
Enumerated
Jan 10, 2007
Record last updated
Nov 1, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20080222000239); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →

Also registered at 393 E Walnut St FL 3

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Iris CruzMental Health Counselor1215118427
  2. Janet Kinkead, D.O.Addiction Medicine (Family Medicine) Physician1801150800
  3. May Lynn, M.D.Family Medicine Physician1992141865
  4. Lilli Ann Reyes, MDFamily Medicine Physician1578641064
  5. Marie Saint Louis, DPMFoot & Ankle Surgery Podiatrist1851546790
  6. Jennifer Sturm, LCSWMental Health Counselor1710229497

Verify Helen Heng-Shan Moon in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A91007    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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16% more Medicare Part D claims than the average hematology & oncology physician in 2024

1,019 Medicare Part D claims for 200 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D.

  1. Helen Moon1,019
  2. Specialty average877

Most prescribed

  1. Anastrozole187 claims
  2. Abiraterone Acetate120 claims
  3. Prednisone89 claims
  4. Ondansetron Hcl62 claims
  5. Lenalidomide58 claims
  6. Dexamethasone41 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.

Industry payments in 2024: $216.96

2 payments; by number, the most common kind was food and beverage; the largest payer was Aveo Pharmaceuticals, Inc. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Helen Moon$216.96
  2. Specialty average$7,481.41

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Southern California Permanente Medical GroupRiverside, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Helen Heng-Shan Moon among 1,583 hematology & oncology physician records in California

Helen Heng-Shan Moon, M.D. is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.

  • NPI issued2007 · 46% of these records are older, 40% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileYes · 71% of these records are
  • Graduated2003 · median 2003 among the 1,124 with a school on file
  • Record last updated2021 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hematology & Oncology Physician providers in California

There are 1,583 hematology & oncology physician records in California.

All 1,583 in California → Every provider in Pasadena → Hematology & Oncology Physician nationwide →

The 8 hematology & oncology physician records with the nearest ZIP codes

  1. John GunnellGlendale, CA 912031487765301
  2. Mercedes Maruscak, N.P.Glendale, CA 912041154356699
  3. Zara Sipan, PA-CGlendale, CA 912041770715369
  4. Kalust Ucar, M.D.Glendale, CA 912041710912175
  5. Amy Wang, MDGlendale, CA 912041720155609
  6. Boris Bagdasarian, D.O.Glendale, CA 912061598758062
  7. Saro Kasparian, M.D.Glendale, CA 912061104350917
  8. Mihran Shirinian, M.D.Glendale, CA 912061730262122

Common questions

What is Helen Heng-Shan Moon, M.D.'s NPI number?

Helen Heng-Shan Moon, M.D.'s National Provider Identifier (NPI) is 1255480075, issued on Jan 10, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Helen Heng-Shan Moon, M.D. located?

The NPPES record lists a practice address at 393 E Walnut St FL 3, Pasadena, CA, 91188. Phone: (951) 353-4931. Providers update this record themselves, so call before visiting.

How can I verify Helen Heng-Shan Moon, M.D.'s license?

NPPES lists California license number A91007, 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 Helen Heng-Shan Moon, M.D. prescribe under Medicare Part D?

In 2024, Helen Heng-Shan Moon, M.D. had 1,019 Medicare Part D claims for 200 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.