Dr. Jeffrey Morito Niizawa, MD
- Medicare services, 2018
- 11
- Part D claims, 2024
- 169
- Hospital affiliations
- 2
- Medical groups
- 3
- State license
- 1
- Practice address
- 26421 Crown Valley Parkway, Suite 140, Mission Viejo, CA 92691
- Practice phone
- Call (949) 365-8836
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Pacific Gastroenterology Endoscopy Center
Surgery Center - Medicare-Certified · Mission Viejo, California
Find Dr. Niizawa's professional email, personal email and mobile number
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Dr. Jeffrey Morito Niizawa is a gastroenterologist in Mission Viejo, California
Dr. Niizawa practices at Pacific Gastroenterology Endoscopy Center in Mission Viejo, California.
Dr. Niizawa's NPI, 1922015445, was assigned on August 1, 2006. Dr. Niizawa graduated from Northwestern University Feinberg Medical School in 1988. Dr. Niizawa holds Arizona license 21760.
- NPI
- 1922015445NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5496774754
- NPI enumeration date
- August 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (949) 365-8836
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jeffrey Morito Niizawa practices at Pacific Gastroenterology Endoscopy Center in Mission Viejo, California
Dr. Niizawa's primary practice is Pacific Gastroenterology Endoscopy Center, at 26421 Crown Valley Parkway, Suite 140, Mission Viejo, CA 92691. The practice phone is (949) 365-8836.
- Pacific Gastroenterology Endoscopy Center26421 Crown Valley Parkway, Suite 140, Mission Viejo, CA 92691Phone(949) 365-8836
Source: Dmand AI Affiliation Data
Dr. Jeffrey Morito Niizawa is affiliated with 5 sites of care and 3 medical groups
Dr. Niizawa's primary practice is Pacific Gastroenterology Endoscopy Center in Mission Viejo, California. Dr. Niizawa is also affiliated with Vallejo Medical Center. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Niizawa to 1 more hospital, 2 group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jeffrey Morito Niizawa's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Niizawa practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Pacific Gastroenterology Endoscopy Center | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jeffrey Morito Niizawa is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Niizawa's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Niizawa is licensed in Arizona.
Specialties and state licenses
- Gastroenterology, ArizonaPrimary
Gastroenterologists near Dr. Niizawa
Counts of gastroenterologists 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. Jeffrey Morito Niizawa billed Medicare for 11 services in 2018
CMS data shows 11 Medicare services from Dr. Niizawa across 1 procedure code in 2018. Medicare paid $1,364 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Niizawa's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Surgery
- 2017: 1232018: 1191%
- Office and hospital visits
- 2017: 1572018: 0100%
Dr. Niizawa compared with the California median for gastroenterologists, 2018
- Dr. Niizawa
- California median
- Medicare services
- 11vs 58698% below
- Part D claims
- 112vs 38071% below
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Niizawa's most billed Medicare procedure codes, 2018
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jeffrey Morito Niizawa's patients have a median age of 57
Across all payers, Dmand AI patient panel data puts Dr. Niizawa's median patient age at 57, with 48% women.
Dr. Niizawa's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women48%
- Men52%
Source: Dmand AI Patient Panel Data
Dr. Jeffrey Morito Niizawa wrote 169 Medicare Part D claims in 2024
In 2024, Dr. Niizawa wrote 169 Medicare Part D claims for 93 patients. 94% of them were for generic drugs. CMS names the drug for 112 of them, across 4 drugs with 11 or more claims each, at $1,383 in total drug cost. In 2023, CMS named 132 claims across 4 drugs.
Dr. Niizawa's Part D claims by kind of drug, 2024
- Generic159 claims94%
- Brand-name and other10 claims6%
Dr. Niizawa's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Niizawa's Part D claims, 2024
- Antibiotics12%21 of 169 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1322024: 11215%
Drugs named by CMS: 4 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Jeffrey Morito Niizawa takes part in Medicare
Dr. Niizawa accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Jeffrey Morito Niizawa graduated from Northwestern University Feinberg Medical School
Dr. Niizawa graduated from Northwestern University Feinberg Medical School in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Jeffrey Morito Niizawa'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 Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| 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)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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Jeffrey Morito Niizawa
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What is Dr. Jeffrey Morito Niizawa's NPI number?
Dr. Jeffrey Morito Niizawa's NPI number is 1922015445. It was assigned on August 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Jeffrey Morito Niizawa?
Dr. Jeffrey Morito Niizawa is a gastroenterologist in Mission Viejo, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Jeffrey Morito Niizawa practice?
Dr. Niizawa practices at 26421 Crown Valley Parkway, Suite 140, Mission Viejo, CA 92691. Dr. Niizawa's primary practice is Pacific Gastroenterology Endoscopy Center in Mission Viejo, California. Dmand AI also links Dr. Niizawa to 1 hospital, 2 group practices and clinics and 2 medical groups.
What is Dr. Jeffrey Morito Niizawa's office phone number?
The practice phone on file for Dr. Niizawa is (949) 365-8836.
What is Dr. Jeffrey Morito Niizawa's medical license number?
Dr. Niizawa holds Arizona license 21760.
Which hospitals is Dr. Jeffrey Morito Niizawa affiliated with?
Dr. Niizawa is affiliated with Vallejo Medical Center. Dmand AI links Dr. Niizawa to 1 more hospital.
What medical group is Dr. Jeffrey Morito Niizawa part of?
Dr. Niizawa is linked to Southern California Permanente Medical Group. Dmand AI links Dr. Niizawa to 2 more medical groups.
Does Dr. Jeffrey Morito Niizawa accept Medicare?
Yes. CMS data shows Dr. Niizawa billed Medicare for 11 services in 2018, and Dr. Niizawa accepts Medicare assignment.
What services does Dr. Jeffrey Morito Niizawa bill to Medicare?
In 2018, Dr. Niizawa's most billed Medicare services were surgery: digestive system (45380).
Where did Dr. Jeffrey Morito Niizawa go to medical school?
Dr. Niizawa graduated from Northwestern University Feinberg Medical School in 1988.
What drugs does Dr. Jeffrey Morito Niizawa prescribe most?
In 2024 Medicare Part D data, Dr. Niizawa's most prescribed drugs by claims were Omeprazole, Pantoprazole Sodium and Gavilyte-C.
How long has Dr. Jeffrey Morito Niizawa been practicing?
Dr. Niizawa graduated from medical school in 1988, 38 years ago.
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