Tammy Lo, MMS, PA-C
NPI 1891269502 · Physician Assistant · Fullerton, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tammy Lo, MMS, PA-C is a Physician Assistant provider in Fullerton, CA (NPI 1891269502).
Provider details
- NPI number
- 1891269502
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- MMS, PA-C
- Sex
- Female
- Sole proprietor
- No
- License
- 56421 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
7 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
611 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 366 | $118 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 115 | $84 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 58 | $13 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 31 | $119 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 25 | $118 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 54 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 120 | 50 |
| Gabapentin | 111 | 48 |
| Atorvastatin Calcium | 103 | 40 |
| Losartan Potassium | 102 | 45 |
| Metoprolol Succinate | 95 | 34 |
| Levothyroxine Sodium | 68 | 22 |
| Lisinopril |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$45 across 2 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
Registry dates
- Enumerated
- 2019-01-15
- Last updated
- 2021-11-05
- Certified
- 2021-11-05
Frequently asked questions
- What is Tammy Lo's NPI number?
- Tammy Lo's National Provider Identifier (NPI) is 1891269502, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tammy Lo's specialty?
- Tammy Lo is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Tammy Lo located?
- Tammy Lo's practice location on file with NPPES is 2141 N Harbor Blvd Ste 25000, Fullerton, CA 92835-3830.
- What is Tammy Lo's phone number?
- The practice phone number listed in the NPPES registry for Tammy Lo is (714) 626-8650.
- Does Tammy Lo accept Medicare?
- Tammy Lo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tammy Lo's NPI active?
- Yes — Tammy Lo's NPI (1891269502) is active in the NPPES registry as of the last update on 2021-11-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.