Dr. Lloyd Stuart Nagasawa, MD
- Medicare services, 2019
- 1,806
- Part D claims, 2020
- 37
- Industry payments
- $11,815
- Affiliated sites
- 2
- Medical groups
- 2
- Practice address
- 26691 Plaza, Mission Viejo, CA 92691-6329
- Practice phone
- Call (949) 347-0600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Minch K. Fong
Medical specialty practice · Mission Viejo, California
Find Dr. Nagasawa'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.
Dr. Lloyd Stuart Nagasawa is a hematologist and oncologist in Mission Viejo, California
Dr. Nagasawa practices at Minch K. Fong in Mission Viejo, California.
Dr. Nagasawa's NPI, 1487647335, was assigned on August 25, 2005. Dr. Nagasawa graduated from John A. Burns School of Medicine in 1982. Dr. Nagasawa's California license number on file is G50164.
- NPI
- 1487647335NPI Registry (opens in a new tab)
- NPI enumeration date
- August 25, 2005
- NPI status
- Active
- Practice phone
- (949) 347-0600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Lloyd Stuart Nagasawa practices at Minch K. Fong in Mission Viejo, California
Dr. Nagasawa's primary practice is Minch K. Fong, at 26691 Plaza, Mission Viejo, CA 92691-6329. The practice phone is (949) 347-0600.
- Minch K. Fong26691 Plaza, Mission Viejo, CA 92691-6329Phone(949) 347-0600
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Lloyd Stuart Nagasawa is affiliated with 2 sites of care and 2 medical groups
Dr. Nagasawa's primary practice is Minch K. Fong in Mission Viejo, California. Dmand AI also links Dr. Nagasawa to 2 medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Lloyd Stuart Nagasawa's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nagasawa practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Minch K. Fong | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Lloyd Stuart Nagasawa is one of 1,502 hematologists and oncologists in California
Hematology and oncology is Dr. Nagasawa's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Nagasawa is board certified in internal medicine by the American Board of Internal Medicine. Dr. Nagasawa has a license on file in California.
Specialties and state licenses
- Hematology and oncology, CaliforniaPrimary
Hematologists and oncologists near Dr. Nagasawa
Counts of hematologists and oncologists 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
Dr. Lloyd Stuart Nagasawa billed Medicare for 1,806 services in 2019
CMS data shows 1,806 Medicare services from Dr. Nagasawa across 9 procedure codes in 2019. Medicare paid $79,056 for them.
Dr. Nagasawa's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 1,4322019: 64855%
- Lab and pathology
- 2018: 1,1722019: 48359%
- Surgery
- 2018: 7102019: 32454%
- Tests and treatments
- 2018: 1,6372019: 31081%
- Drugs given in the office
- 2018: 4,8202019: 4199%
Where Dr. Nagasawa's Medicare services took place, 2019
- In an office1,77398%
- In a facility332%
Dr. Nagasawa compared with the California median for hematologists and oncologists, 2019
- Dr. Nagasawa
- California median
- Medicare services
- 1,806vs 93294% above
- Part D claims
- 37vs 39491% below
Medians across 1,367 hematologists and oncologists in California with Dmand AI profiles that report each measure.
Dr. Nagasawa's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nagasawa and other hematologists and oncologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Lloyd Stuart Nagasawa's patients have a median age of 78
Across all payers, Dmand AI patient panel data puts Dr. Nagasawa's median patient age at 78, with 83% women.
Dr. Nagasawa's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women83%
- Men17%
Source: Dmand AI Patient Panel Data
Dr. Lloyd Stuart Nagasawa wrote 37 Medicare Part D claims in 2020
In 2020, Dr. Nagasawa wrote 37 Medicare Part D claims. They cover 2 drugs, with $132,816 in total drug cost. In 2019, CMS named 373 claims across 8 drugs.
Dr. Nagasawa's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 3732020: 3790%
Drugs named by CMS: 2 in 2020, 8 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Lloyd Stuart Nagasawa received $11,815 in industry payments from 2016 to 2023
CMS Open Payments shows 573 general payments to Dr. Nagasawa from 53 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 95% of the total. Novartis Pharmaceuticals Corporation paid the most, $1,559.
General payments to Dr. Nagasawa by program year, 2016 to 2023
General payments to Dr. Nagasawa by kind, 2016 to 2023
- Food and beverage$11,23295%
- Education$5825%
Companies that paid Dr. Nagasawa the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Lloyd Stuart Nagasawa graduated from John A. Burns School of Medicine
Dr. Nagasawa graduated from John A. Burns School of Medicine in 1982.
- Medical school
- Board certified in internal medicine
- Board certified in medical oncology
Source: Dmand AI Professional Profile Data
Dr. Lloyd Stuart Nagasawa accepts plans from 3 insurance carriers
Dr. Nagasawa is in network with 3 carriers, including Elevance, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Massachusetts
- HCSC
Plan types Dr. Nagasawa accepts, by number of carriers
- Medicare3
- PPO3
- EPO1
- HMO1
- Medicaid1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Lloyd Stuart Nagasawa'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 | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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 Dr. Lloyd Stuart Nagasawa
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Lloyd Stuart Nagasawa's NPI number?
Dr. Lloyd Stuart Nagasawa's NPI number is 1487647335. It was assigned on August 25, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Lloyd Stuart Nagasawa?
Dr. Lloyd Stuart Nagasawa is a hematologist and oncologist in Mission Viejo, California. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Lloyd Stuart Nagasawa practice?
Dr. Nagasawa practices at 26691 Plaza, Mission Viejo, CA 92691-6329. Dr. Nagasawa's primary practice is Minch K. Fong in Mission Viejo, California. Dmand AI also links Dr. Nagasawa to 2 medical groups and 1 group practice or clinic.
What is Dr. Lloyd Stuart Nagasawa's office phone number?
The practice phone on file for Dr. Nagasawa is (949) 347-0600.
What is Dr. Lloyd Stuart Nagasawa's medical license number?
Dr. Nagasawa's California license number on file is G50164.
Does Dr. Lloyd Stuart Nagasawa accept Medicare?
Yes. CMS data shows Dr. Nagasawa billed Medicare for 1,806 services in 2019.
Is Dr. Lloyd Stuart Nagasawa board certified?
Yes. Dr. Nagasawa is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Lloyd Stuart Nagasawa bill to Medicare?
In 2019, Dr. Nagasawa's most billed Medicare services were office visit, established patient (99214), lab and pathology test (85025) and surgery: heart and blood vessels (36415).
Where did Dr. Lloyd Stuart Nagasawa go to medical school?
Dr. Nagasawa graduated from John A. Burns School of Medicine in 1982.
What drugs does Dr. Lloyd Stuart Nagasawa prescribe most?
In 2020 Medicare Part D data, Dr. Nagasawa's most prescribed drugs by claims were Letrozole and Zytiga.
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Has Dr. Lloyd Stuart Nagasawa received payments from drug or device companies?
CMS Open Payments shows $11,815 in general payments to Dr. Nagasawa from 53 companies from 2016 to 2023. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. Lloyd Stuart Nagasawa been practicing?
Dr. Nagasawa graduated from medical school in 1982, 44 years ago.
What insurance does Dr. Lloyd Stuart Nagasawa accept?
Dr. Nagasawa is in network with 3 carriers, including Elevance, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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