Tammy Eileen Lo, MMSC, PA-C
- Medicare patients, 2024
- 347
- Part D claims, 2024
- 2,352
- Hospital affiliations
- 1
- Industry payments
- $23
- Medical group
- 1
- Practice address
- 2141 N Harbor Blvd, Fullerton, CA 92835
- Practice phone
- Call (714) 449-4900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Providence Medical Foundation
Fullerton, California
Find Tammy Lo's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Tammy Eileen Lo is a physician assistant in Fullerton, California
Tammy Lo practices at Providence Medical Foundation in Fullerton, California.
Tammy Lo's NPI, 1891269502, was assigned on January 15, 2019. Tammy Lo holds California license 56421.
- NPI
- 1891269502NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4789926957
- NPI enumeration date
- January 15, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (714) 449-4900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Tammy Eileen Lo practices at Providence Medical Foundation in Fullerton, California
Tammy Lo's primary practice is Providence Medical Foundation, at 2141 N Harbor Blvd, Fullerton, CA 92835 in Orange County. The practice phone is (714) 449-4900.
- Providence Medical Foundation2141 N Harbor Blvd, Fullerton, CA 92835 · Orange CountyPhone(714) 449-4900
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Tammy Eileen Lo is affiliated with 3 sites of care and 1 medical group
Tammy Lo's primary practice is Providence Medical Foundation in Fullerton, California. Tammy Lo is also affiliated with Providence St. Jude Medical Center. The medical group on file is St. Jude Heritage Medical Group. Dmand AI also links Tammy Lo to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Tammy Eileen Lo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Tammy Lo practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Providence Medical Foundation | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Tammy Eileen Lo is one of 11,482 physician assistants in California
Physician assistant is Tammy Lo's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Tammy Lo is licensed in California.
Specialties and state licenses
- Physician assistant, CaliforniaPrimary
Physician assistants near Tammy Lo
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Tammy Eileen Lo treated 347 Medicare patients in 2024, average age 77
CMS counts 347 Medicare patients who saw Tammy Lo in 2024. The largest group is 75 to 84, with 137 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 9% are also on Medicaid. Their average risk score is 1.50, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Tammy Lo's median patient age at 71, with 65% women.
Tammy Lo's Medicare patients by age, 2024
Tammy Lo's Medicare patients by sex, 2024
- Women21161%
- Men13639%
Chronic conditions among Tammy Lo's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis65%
- Osteoporosis33%
- Mood disorders30%
- Chronic kidney disease28%
- Depression28%
- Anxiety27%
Share of Medicare patients with each condition. A patient can have several.
Tammy Lo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women65%
- Men35%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Tammy Eileen Lo wrote 2,352 Medicare Part D claims in 2024
In 2024, Tammy Lo wrote 2,352 Medicare Part D claims for 578 patients. 91% of them were for generic drugs.
Tammy Lo's Part D claims by kind of drug, 2024
- Generic2,148 claims91%
- Brand-name and other204 claims9%
Drug classes CMS tracks in Tammy Lo's Part D claims, 2024
- Opioids1%13 of 2,352 claims
- Antibiotics8%195 of 2,352 claims
- Antipsychotics, patients 65 and over1%27 of 2,352 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Tammy Eileen Lo offers telehealth to Medicare patients
Tammy Lo accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Tammy Lo as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Tammy Eileen Lo received $23 in industry payments in 2025
CMS Open Payments shows 1 general payment to Tammy Lo from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $23.
Companies that paid Tammy Lo the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Tammy Eileen Lo's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Tammy Eileen Lo
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Tammy Eileen Lo's NPI number?
Tammy Eileen Lo's NPI number is 1891269502. It was assigned on January 15, 2019, and it is active in the NPI Registry.
What does Tammy Eileen Lo specialize in?
Tammy Eileen Lo is a physician assistant in Fullerton, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Tammy Eileen Lo practice?
Tammy Lo practices at 2141 N Harbor Blvd, Fullerton, CA 92835. Tammy Lo's primary practice is Providence Medical Foundation in Fullerton, California. Dmand AI also links Tammy Lo to 1 group practice or clinic.
What is Tammy Eileen Lo's office phone number?
The practice phone on file for Tammy Lo is (714) 449-4900.
What is Tammy Eileen Lo's medical license number?
Tammy Lo holds California license 56421.
Which hospitals is Tammy Eileen Lo affiliated with?
Tammy Lo is affiliated with Providence St. Jude Medical Center.
What medical group is Tammy Eileen Lo part of?
Tammy Lo is linked to St. Jude Heritage Medical Group.
Does Tammy Eileen Lo accept Medicare?
Yes. CMS lists Tammy Lo as accepting Medicare assignment.
Does Tammy Eileen Lo offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Tammy Lo as offering telehealth services.
How many Medicare patients does Tammy Eileen Lo see?
CMS counts 347 Medicare patients who saw Tammy Lo in 2024, with an average age of 77.
Has Tammy Eileen Lo received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Tammy Lo from 1 company from 2025 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Tammy Eileen Lo been practicing?
Tammy Lo graduated from medical school in 2018, 8 years ago.
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