Dr. George A. Tjionas, MD
- Medicare services, 2024
- 1,071
- Medicare patients, 2024
- 391
- MIPS score, 2024
- 100
- Hospital affiliations
- 3
- Medical group
- 1
- Practice address
- 55 North Ave, Mendon, MA 01756
- Practice phone
- Call (508) 334-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Umass Memorial Medical Center
Mendon, Massachusetts
Find Dr. Tjionas' professional email, personal email and mobile number
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Dr. George A. Tjionas is a clinical pathology physician in Mendon, Massachusetts
Dr. Tjionas practices at Umass Memorial Medical Center in Mendon, Massachusetts.
Dr. Tjionas' NPI, 1982946307, was assigned on March 24, 2013. Dr. Tjionas holds Massachusetts license 273014.
- NPI
- 1982946307NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6002178795
- NPI enumeration date
- March 24, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (508) 334-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. George A. Tjionas practices at Umass Memorial Medical Center in Mendon, Massachusetts
Dr. Tjionas' primary practice is Umass Memorial Medical Center, at 55 North Ave, Mendon, MA 01756 in Worcester County. The practice phone is (508) 334-1000.
- Umass Memorial Medical Center55 North Ave, Mendon, MA 01756 · Worcester CountyPhone(508) 334-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. George A. Tjionas is affiliated with 4 sites of care and 1 medical group
Dr. Tjionas' primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dr. Tjionas is also affiliated with UMass Memorial Medical Center - University Campus. The medical group on file is UMass Memorial Medical Group. Dmand AI also links Dr. Tjionas to 2 more hospitals, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. George A. Tjionas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tjionas practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Umass Memorial Medical Center | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. George A. Tjionas is one of 28 clinical pathology physicians in Massachusetts
Clinical pathology is Dr. Tjionas' primary specialty in the NPI Registry, under taxonomy code 207ZC0006X. Dr. Tjionas is licensed in Massachusetts.
Specialties and state licenses
- Clinical pathology, MassachusettsPrimary
Clinical pathology physicians near Dr. Tjionas
Counts of clinical pathology physicians 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. George A. Tjionas billed Medicare for 1,071 services in 2024
CMS data shows 1,071 Medicare services from Dr. Tjionas across 10 procedure codes in 2024, for 391 Medicare patients. Medicare paid $32,245 for them.
Dr. Tjionas' Medicare services by type, 2024
- Lab and pathology1,039
- Other services32
Where Dr. Tjionas' Medicare services took place, 2024
- In an office41138%
- In a facility66062%
Dr. Tjionas compared with the Massachusetts median for clinical pathology physicians, 2024
- Dr. Tjionas
- Massachusetts median
- Medicare services
- 1,071vs 54098% above
- Medicare patients
- 391vs 31425% above
Medians across 22 clinical pathology physicians in Massachusetts with Dmand AI profiles that report each measure.
Dr. Tjionas' 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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. George A. Tjionas treated 391 Medicare patients in 2024, average age 72
CMS counts 391 Medicare patients who saw Dr. Tjionas in 2024. The largest group is 65 to 74, with 178 patients. 75% of them have high cholesterol, and 72% have high blood pressure. 33% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tjionas' median patient age at 61, with 49% women.
Dr. Tjionas' Medicare patients by age, 2024
Dr. Tjionas' Medicare patients by sex, 2024
- Women23259%
- Men15941%
Chronic conditions among Dr. Tjionas' Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Arthritis47%
- Cancer43%
- Anxiety40%
- Mood disorders39%
- Depression33%
- Diabetes31%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tjionas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women49%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. George A. Tjionas scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Tjionas for performance year 2024, reported through an alternative payment model (APM). Dr. Tjionas accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Tjionas' MIPS scores, performance year 2024
- 100of 100Final score
- 83of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
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
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Sources for Dr. George A. Tjionas'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 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) |
| 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) |
| 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. George A. Tjionas
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. George A. Tjionas' NPI number?
Dr. George A. Tjionas' NPI number is 1982946307. It was assigned on March 24, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. George A. Tjionas?
Dr. George A. Tjionas is a clinical pathology physician in Mendon, Massachusetts. The primary specialty in the NPI Registry is Clinical Pathology Physician (taxonomy code 207ZC0006X).
Where does Dr. George A. Tjionas practice?
Dr. Tjionas practices at 55 North Ave, Mendon, MA 01756. Dr. Tjionas' primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dmand AI also links Dr. Tjionas to 2 hospitals.
What is Dr. George A. Tjionas' office phone number?
The practice phone on file for Dr. Tjionas is (508) 334-1000.
What is Dr. George A. Tjionas' medical license number?
Dr. Tjionas holds Massachusetts license 273014.
Which hospitals is Dr. George A. Tjionas affiliated with?
Dr. Tjionas is affiliated with UMass Memorial Medical Center - University Campus. Dmand AI links Dr. Tjionas to 2 more hospitals.
What medical group is Dr. George A. Tjionas part of?
Dr. Tjionas is linked to UMass Memorial Medical Group.
Does Dr. George A. Tjionas accept Medicare?
Yes. CMS data shows Dr. Tjionas billed Medicare for 1,071 services in 2024, and Dr. Tjionas accepts Medicare assignment.
What is Dr. George A. Tjionas' MIPS score?
Dr. Tjionas' MIPS final score for performance year 2024 is 100 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. George A. Tjionas see?
CMS counts 391 Medicare patients who saw Dr. Tjionas in 2024, with an average age of 72.
What services does Dr. George A. Tjionas bill to Medicare?
In 2024, Dr. Tjionas' most billed Medicare services were lab and pathology test (88305), lab and pathology test (88341) and lab and pathology test (88342).
How long has Dr. George A. Tjionas been practicing?
Dr. Tjionas graduated from medical school in 2013, 13 years ago.
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