Dr. Nasser T. Liasi, MD
- Medicare services, 2024
- 194
- Medicare patients, 2024
- 137
- Part D claims, 2024
- 2,611
- Hospital affiliations
- 1
- Industry payments
- $33
- Practice address
- 400 North Pepper Avenue, Colton, CA 92324
- Practice phone
- Call (909) 580-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Liasi'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. Nasser T. Liasi is an internist in Colton, California
Dr. Liasi practices at Arrowhead Regional Medical Center in Colton, California, part of San Bernardino County.
Dr. Liasi's NPI, 1144466780, was assigned on January 4, 2009. Dr. Liasi graduated from Mashhad University of Medical Sciences in 1987. Dr. Liasi holds California license A115058.
- NPI
- 1144466780NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5092987586
- NPI enumeration date
- January 4, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 580-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nasser T. Liasi practices at Arrowhead Regional Medical Center in Colton, California
Dr. Liasi's primary practice is Arrowhead Regional Medical Center, at 400 North Pepper Avenue, Colton, CA 92324 in San Bernardino County. The practice phone is (909) 580-1000.
- Arrowhead Regional Medical Center400 North Pepper Avenue, Colton, CA 92324 · San Bernardino CountyPhone(909) 580-1000
Source: Dmand AI Affiliation Data
Dr. Nasser T. Liasi is affiliated with 3 sites of care and 3 medical groups
Dr. Liasi's primary practice is Arrowhead Regional Medical Center in Colton, California, part of San Bernardino County. The medical group on file is Quantum Healthcare Medical Associates Inc. Dmand AI also links Dr. Liasi to 2 more medical groups, 1 group practice or clinic and 1 home health agency, 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. Nasser T. Liasi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Liasi practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Arrowhead Regional Medical Center | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nasser T. Liasi is one of 16,751 internists in California
Internal medicine is Dr. Liasi's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Liasi is board certified in internal medicine by the American Board of Internal Medicine. Dr. Liasi is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acute kidney failure, acute skin infection, arthritis, atrial fibrillation and flutter, chronic diabetes, chronic hypertension, chronic obstructive pulmonary disease (COPD) and chronic respiratory failure among the conditions Dr. Liasi treats.
Internists near Dr. Liasi
Counts of internists 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. Nasser T. Liasi billed Medicare for 194 services in 2024
CMS data shows 194 Medicare services from Dr. Liasi across 2 procedure codes in 2024, all of them office visits, for 137 Medicare patients. Medicare paid $12,817 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Liasi's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1912024: 1942%
Dr. Liasi compared with the California median for internists, 2024
- Dr. Liasi
- California median
- Medicare services
- 194vs 36146% below
- Medicare patients
- 137vs 1519% below
- Part D claims
- 1,988vs 4214.7 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Liasi's most billed Medicare procedure codes, 2024
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. Liasi and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nasser T. Liasi treated 137 Medicare patients in 2024, average age 68
CMS counts 137 Medicare patients who saw Dr. Liasi in 2024. The largest group is 65 to 74, with 73 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 91% are also on Medicaid. Their average risk score is 1.98, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Liasi's median patient age at 55, with 53% women.
Dr. Liasi's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Liasi's Medicare patients by sex, 2024
- Women6950%
- Men6850%
Chronic conditions among Dr. Liasi's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes53%
- Arthritis31%
- Chronic kidney disease30%
- Heart failure29%
- Ischemic heart disease19%
- Tobacco use18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Liasi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nasser T. Liasi wrote 2,611 Medicare Part D claims in 2024
In 2024, Dr. Liasi wrote 2,611 Medicare Part D claims for 229 patients. 73% of them were for generic drugs. CMS names the drug for 1,988 of them, across 62 drugs with 11 or more claims each, at $328,293 in total drug cost. In 2023, CMS named 1,231 claims across 47 drugs.
Dr. Liasi's Part D claims by kind of drug, 2024
- Generic1,904 claims73%
- Brand-name596 claims23%
- Other111 claims4%
Dr. Liasi'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. Liasi's Part D claims, 2024
- Opioids2%59 of 2,611 claims
- Antibiotics1%39 of 2,611 claims
- Antipsychotics, patients 65 and over0%11 of 2,611 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: 1,2312024: 1,98861%
Drugs named by CMS: 62 in 2024, 47 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. Nasser T. Liasi takes part in Medicare
Dr. Liasi accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Nasser T. Liasi received $33 in industry payments in 2024
CMS Open Payments shows 2 general payments to Dr. Liasi from 1 drug or device company in 2024. Education make up the largest share, 100% of the total. Agios Pharmaceuticals, Inc. paid the most, $33.
Companies that paid Dr. Liasi the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nasser T. Liasi graduated from Mashhad University of Medical Sciences
Dr. Liasi graduated from Mashhad University of Medical Sciences in 1987.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Nasser T. Liasi'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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| Industry payments | Open Payments (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. Nasser T. Liasi
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. Nasser T. Liasi's NPI number?
Dr. Nasser T. Liasi's NPI number is 1144466780. It was assigned on January 4, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Nasser T. Liasi?
Dr. Nasser T. Liasi is an internist in Colton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Nasser T. Liasi practice?
Dr. Liasi practices at 400 North Pepper Avenue, Colton, CA 92324. Dr. Liasi's primary practice is Arrowhead Regional Medical Center in Colton, California, part of San Bernardino County. Dmand AI also links Dr. Liasi to 2 medical groups, 1 group practice or clinic and 1 home health agency.
What is Dr. Nasser T. Liasi's office phone number?
The practice phone on file for Dr. Liasi is (909) 580-1000.
What is Dr. Nasser T. Liasi's medical license number?
Dr. Liasi holds California license A115058.
Which hospitals is Dr. Nasser T. Liasi affiliated with?
Dr. Liasi practices at Arrowhead Regional Medical Center in Colton, California.
What medical group is Dr. Nasser T. Liasi part of?
Dr. Liasi is linked to Quantum Healthcare Medical Associates Inc. Dmand AI links Dr. Liasi to 2 more medical groups.
Does Dr. Nasser T. Liasi accept Medicare?
Yes. CMS data shows Dr. Liasi billed Medicare for 194 services in 2024, and Dr. Liasi accepts Medicare assignment.
How many Medicare patients does Dr. Nasser T. Liasi see?
CMS counts 137 Medicare patients who saw Dr. Liasi in 2024, with an average age of 68.
Is Dr. Nasser T. Liasi board certified?
Yes. Dr. Liasi is board certified in internal medicine by the American Board of Internal Medicine.
Show 5 more questionsShow fewer questions
What services does Dr. Nasser T. Liasi bill to Medicare?
In 2024, Dr. Liasi's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Nasser T. Liasi go to medical school?
Dr. Liasi graduated from Mashhad University of Medical Sciences in 1987.
What drugs does Dr. Nasser T. Liasi prescribe most?
In 2024 Medicare Part D data, Dr. Liasi's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Metformin HCl.
Has Dr. Nasser T. Liasi received payments from drug or device companies?
CMS Open Payments shows $33 in general payments to Dr. Liasi from 1 company from 2024 to 2024. The largest total came from Agios Pharmaceuticals, Inc.
How long has Dr. Nasser T. Liasi been practicing?
Dr. Liasi graduated from medical school in 1987, 39 years ago.
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