Dr. Lawrence P. Gassner, MD
- Medicare services, 2024
- 589
- Medicare patients, 2024
- 199
- Part D claims, 2024
- 3,462
- MIPS score, 2024
- 89
- Industry payments
- $4,764
- Practice address
- 3720 E La Salle St, Phoenix, AZ 85040
- Practice phone
- Call (602) 971-5500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Tatum Ridge Internal Medicine PLC
Phoenix, Arizona
Find Dr. Gassner'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. Lawrence P. Gassner is an internist in Phoenix, Arizona
Dr. Gassner practices at Tatum Ridge Internal Medicine PLC in Phoenix, Arizona.
Dr. Gassner's NPI, 1558379461, was assigned on August 4, 2006. Dr. Gassner graduated from Washington University School of Medicine in 1988. Dr. Gassner holds Arizona license 19150.
- NPI
- 1558379461NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688668403
- NPI enumeration date
- August 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (602) 971-5500
- 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 Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Lawrence P. Gassner practices at Tatum Ridge Internal Medicine PLC in Phoenix, Arizona
Dr. Gassner's primary practice is Tatum Ridge Internal Medicine PLC, at 3720 E La Salle St, Phoenix, AZ 85040 in Maricopa County. The practice phone is (602) 971-5500.
- Tatum Ridge Internal Medicine PLC3720 E La Salle St, Phoenix, AZ 85040 · Maricopa CountyPhone(602) 971-5500
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Lawrence P. Gassner is affiliated with 2 sites of care and 1 medical group
Dr. Gassner's primary practice is Tatum Ridge Internal Medicine PLC in Phoenix, Arizona. The medical group on file is Tatum Ridge Internal Medicine. Dmand AI also links Dr. Gassner 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 Dr. Lawrence P. Gassner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gassner practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Tatum Ridge Internal Medicine PLC | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Lawrence P. Gassner is one of 2,420 internists in Arizona
Internal medicine is Dr. Gassner's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gassner is licensed in Arizona.
Specialties and state licenses
- Internal medicine, ArizonaPrimary
Internists near Dr. Gassner
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. Lawrence P. Gassner billed Medicare for 589 services in 2024
CMS data shows 589 Medicare services from Dr. Gassner across 6 procedure codes in 2024, for 199 Medicare patients. Medicare paid $48,607 for them. Every service was in an office.
Dr. Gassner's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2822024: 2851%
- Other services
- 2023: 2412024: 241No change
- Tests and treatments
- 2023: 682024: 637%
Dr. Gassner compared with the Arizona median for internists, 2024
- Dr. Gassner
- Arizona median
- Medicare services
- 589vs 47624% above
- Medicare patients
- 199vs 205Close to median
- Part D claims
- 2,960vs 26011.4 times
Medians across 2,300 internists in Arizona with Dmand AI profiles that report each measure.
Dr. Gassner'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.
Need commercial claims for Dr. Gassner?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gassner and other internists in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Lawrence P. Gassner treated 199 Medicare patients in 2024, average age 77
CMS counts 199 Medicare patients who saw Dr. Gassner in 2024. The largest group is 75 to 84, with 106 patients. 75% of them have high cholesterol, and 65% have high blood pressure. Their average risk score is 0.89, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gassner's median patient age at 77, with 44% women.
Dr. Gassner's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Gassner's Medicare patients by sex, 2024
- Women8442%
- Men11558%
Chronic conditions among Dr. Gassner's Medicare patients, 2024
- High cholesterol75%
- High blood pressure65%
- Arthritis53%
- Ischemic heart disease25%
- Mood disorders21%
- Cancer20%
- Depression20%
- Atrial fibrillation19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gassner's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women44%
- Men55%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Lawrence P. Gassner wrote 3,462 Medicare Part D claims in 2024
In 2024, Dr. Gassner wrote 3,462 Medicare Part D claims for 216 patients. 85% of them were for generic drugs. CMS names the drug for 2,960 of them, across 68 drugs with 11 or more claims each, at $312,594 in total drug cost. In 2023, CMS named 2,700 claims across 64 drugs.
Dr. Gassner's Part D claims by kind of drug, 2024
- Generic2,949 claims85%
- Brand-name502 claims15%
- Other11 claims0%
Dr. Gassner'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. Gassner's Part D claims, 2024
- Opioids1%40 of 3,462 claims
- Antibiotics3%93 of 3,462 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: 2,7002024: 2,96010%
Drugs named by CMS: 68 in 2024, 64 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
Dr. Lawrence P. Gassner scored 89 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 89 out of 100 for Dr. Gassner for performance year 2024, reported as part of a group. Dr. Gassner accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gassner as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Gassner's MIPS scores, performance year 2024
- 89of 100Final score
- 95of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 68of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Lawrence P. Gassner received $4,764 in industry payments from 2016 to 2025
CMS Open Payments shows 226 general payments to Dr. Gassner from 33 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $1,097.
General payments to Dr. Gassner by program year, 2016 to 2025
General payments to Dr. Gassner by kind, 2016 to 2025
- Food and beverage$4,760100%
- Education$40%
Companies that paid Dr. Gassner the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Lawrence P. Gassner graduated from Washington University School of Medicine
Dr. Gassner graduated from Washington University School of Medicine in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Lawrence P. Gassner'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 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)Clinician Public Reporting: Overall MIPS Performance (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. Lawrence P. Gassner
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. Lawrence P. Gassner's NPI number?
Dr. Lawrence P. Gassner's NPI number is 1558379461. It was assigned on August 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Lawrence P. Gassner?
Dr. Lawrence P. Gassner is an internist in Phoenix, Arizona. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Lawrence P. Gassner practice?
Dr. Gassner practices at 3720 E La Salle St, Phoenix, AZ 85040. Dr. Gassner's primary practice is Tatum Ridge Internal Medicine PLC in Phoenix, Arizona. Dmand AI also links Dr. Gassner to 1 group practice or clinic.
What is Dr. Lawrence P. Gassner's office phone number?
The practice phone on file for Dr. Gassner is (602) 971-5500.
What is Dr. Lawrence P. Gassner's medical license number?
Dr. Gassner holds Arizona license 19150.
What medical group is Dr. Lawrence P. Gassner part of?
Dr. Gassner is linked to Tatum Ridge Internal Medicine.
Does Dr. Lawrence P. Gassner accept Medicare?
Yes. CMS data shows Dr. Gassner billed Medicare for 589 services in 2024, and Dr. Gassner accepts Medicare assignment.
Does Dr. Lawrence P. Gassner offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Gassner as offering telehealth services.
What is Dr. Lawrence P. Gassner's MIPS score?
Dr. Gassner's MIPS final score for performance year 2024 is 89 out of 100, reported as part of a group.
How many Medicare patients does Dr. Lawrence P. Gassner see?
CMS counts 199 Medicare patients who saw Dr. Gassner in 2024, with an average age of 77.
Show 5 more questionsShow fewer questions
What services does Dr. Lawrence P. Gassner bill to Medicare?
In 2024, Dr. Gassner's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and vaccine or vaccine administration (90662).
Where did Dr. Lawrence P. Gassner go to medical school?
Dr. Gassner graduated from Washington University School of Medicine in 1988.
What drugs does Dr. Lawrence P. Gassner prescribe most?
In 2024 Medicare Part D data, Dr. Gassner's most prescribed drugs by claims were Rosuvastatin Calcium, Levothyroxine Sodium and Atorvastatin Calcium.
Has Dr. Lawrence P. Gassner received payments from drug or device companies?
CMS Open Payments shows $4,764 in general payments to Dr. Gassner from 33 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Lawrence P. Gassner been practicing?
Dr. Gassner graduated from medical school in 1988, 38 years ago.
Selling to internal medicine practices?
See internists in Arizona by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card