Merrill Shum, M.D.
NPI 1982819702 · Hematology & Oncology Physician · Whittier, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Merrill Shum, M.D. is a Hematology & Oncology Physician provider in Whittier, CA (NPI 1982819702).
Provider details
- NPI number
- 1982819702
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD428611 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
7,847 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 3,545 | $83 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 975 | $141 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 643 | $16 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 603 | $124 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 425 | $5 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 59 | 16 |
| Anastrozole | 36 | 13 |
| Epoetin Alfabrand: Procrit | 33 | — |
| Ondansetron Hcl | 30 | 18 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 21 | — |
| Lenvatinib Mesylatebrand: Lenvima | 21 | — |
| Morphine Sulfate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$16,545 across 283 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1701 W Saint Marys Rd Ste 100Tucson, AZ 85745-2621Phone: (520) 276-2270Fax: (520) 585-5827
Registry dates
- Enumerated
- 2007-05-14
- Last updated
- 2019-08-19
Frequently asked questions
- What is Merrill Shum's NPI number?
- Merrill Shum's National Provider Identifier (NPI) is 1982819702, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Merrill Shum's specialty?
- Merrill Shum is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Merrill Shum located?
- Merrill Shum's practice location on file with NPPES is 8135 Painter Ave, Whittier, CA 90602-3158.
- What is Merrill Shum's phone number?
- The practice phone number listed in the NPPES registry for Merrill Shum is (562) 698-6888.
- Does Merrill Shum accept Medicare?
- Merrill Shum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Merrill Shum's NPI active?
- Yes — Merrill Shum's NPI (1982819702) is active in the NPPES registry as of the last update on 2019-08-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.