Dr. Vernissia Tam, MD
- Medicare services, 2024
- 252
- Medicare patients, 2024
- 157
- Part D claims, 2024
- 89
- MIPS score, 2024
- 83
- Hospital affiliations
- 1
- Practice address
- 400 West Seventh St, Frederick, MD 21701
- Practice phone
- Call (240) 566-3300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Tam'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. Vernissia Tam is a colorectal surgeon in Frederick, Maryland
Dr. Tam practices at Frederick Health Hospital in Frederick, Maryland, part of Frederick Health.
Dr. Tam's NPI, 1528344116, was assigned on October 26, 2011. Dr. Tam holds Maryland license D0092081.
- NPI
- 1528344116NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6608274634
- NPI enumeration date
- October 26, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (240) 566-3300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Vernissia Tam practices at Frederick Health Hospital in Frederick, Maryland
Dr. Tam's primary practice is Frederick Health Hospital, at 400 West Seventh St, Frederick, MD 21701 in Frederick County. The practice phone is (240) 566-3300.
- Frederick Health Hospital400 West Seventh St, Frederick, MD 21701 · Frederick CountyPhone(240) 566-3300
Source: Dmand AI Affiliation Data
Dr. Vernissia Tam is affiliated with 3 sites of care and 1 medical group
Dr. Tam's primary practice is Frederick Health Hospital in Frederick, Maryland, part of Frederick Health. The medical group on file is Frederick Health Medical Group. Dmand AI also links Dr. Tam to 1 more 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. Vernissia Tam's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tam practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Frederick Health Hospital | Available with a free account |
| +2 more affiliated sites | 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 Frederick Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Vernissia Tam is one of 24 colorectal surgeons in Maryland
Colon and rectal surgery is Dr. Tam's primary specialty in the NPI Registry, under taxonomy code 208C00000X. Dr. Tam is licensed in Maryland.
Specialties and state licenses
- Colon and rectal surgery, MarylandPrimary
Colorectal surgeons near Dr. Tam
Counts of colorectal surgeons 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. Vernissia Tam billed Medicare for 252 services in 2024
CMS data shows 252 Medicare services from Dr. Tam across 7 procedure codes in 2024, for 157 Medicare patients. Medicare paid $28,134 for them.
Dr. Tam's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1452024: 18528%
- Surgery
- 2023: 582024: 6716%
- Other services
- 2023: 192024: 0100%
Where Dr. Tam's Medicare services took place, 2024
- In an office24196%
- In a facility114%
Dr. Tam compared with the Maryland median for colorectal surgeons, 2024
- Dr. Tam
- Maryland median
- Medicare services
- 252vs 40237% below
- Medicare patients
- 157vs 27242% below
- Part D claims
- 70vs 6017% above
Medians across 26 colorectal surgeons in Maryland with Dmand AI profiles that report each measure.
Dr. Tam'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. Tam?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Tam and other colorectal surgeons in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Vernissia Tam treated 157 Medicare patients in 2024, average age 75
CMS counts 157 Medicare patients who saw Dr. Tam in 2024. The largest group is 65 to 74, with 65 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.27, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tam's median patient age at 55, with 55% women.
Dr. Tam's Medicare patients by age, 2024
Dr. Tam's Medicare patients by sex, 2024
- Women9259%
- Men6541%
Chronic conditions among Dr. Tam's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Ischemic heart disease36%
- Cancer32%
- Diabetes32%
- Mood disorders29%
- Anxiety28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tam'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
- Women55%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Vernissia Tam wrote 89 Medicare Part D claims in 2024
In 2024, Dr. Tam wrote 89 Medicare Part D claims for 31 patients. 100% of them were for generic drugs. CMS names the drug for 70 of them, across 3 drugs with 11 or more claims each, at $210 in total drug cost. In 2022, CMS named 45 claims across 3 drugs.
Dr. Tam'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. Tam's Part D claims, 2024
- Opioids53%47 of 89 claims
- Antibiotics16%14 of 89 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, 2022 to 2024
- 2022
- 2024
- Claims for drugs CMS names
- 2022: 452024: 7056%
Drugs named by CMS: 3 in 2024, 3 in 2022.
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. Vernissia Tam scored 83 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Dr. Tam for performance year 2024, reported as part of a group. Dr. Tam accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 11 procedures of colonoscopy by Dr. Tam, more than 41% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Tam's MIPS scores, performance year 2024
- 83of 100Final score
- 75.5of 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.
Where Dr. Tam ranks in Medicare procedure volume
- Colonoscopy
- 41st percentile11 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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. Vernissia Tam received $764 in industry payments from 2022 to 2025
CMS Open Payments shows 19 general payments to Dr. Tam from 8 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 100% of the total. Intuitive Surgical, Inc. paid the most, $305.
General payments to Dr. Tam by program year, 2022 to 2025
Companies that paid Dr. Tam the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Vernissia Tam'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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (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. Vernissia Tam
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. Vernissia Tam's NPI number?
Dr. Vernissia Tam's NPI number is 1528344116. It was assigned on October 26, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Vernissia Tam?
Dr. Vernissia Tam is a colorectal surgeon in Frederick, Maryland. The primary specialty in the NPI Registry is Colon & Rectal Surgery Physician (taxonomy code 208C00000X).
Where does Dr. Vernissia Tam practice?
Dr. Tam practices at 400 West Seventh St, Frederick, MD 21701. Dr. Tam's primary practice is Frederick Health Hospital in Frederick, Maryland, part of Frederick Health. Dmand AI also links Dr. Tam to 1 group practice or clinic and 1 home health agency.
What is Dr. Vernissia Tam's office phone number?
The practice phone on file for Dr. Tam is (240) 566-3300.
What is Dr. Vernissia Tam's medical license number?
Dr. Tam holds Maryland license D0092081.
Which hospitals is Dr. Vernissia Tam affiliated with?
Dr. Tam practices at Frederick Health Hospital in Frederick, Maryland.
What medical group is Dr. Vernissia Tam part of?
Dr. Tam is linked to Frederick Health Medical Group.
Does Dr. Vernissia Tam accept Medicare?
Yes. CMS data shows Dr. Tam billed Medicare for 252 services in 2024, and Dr. Tam accepts Medicare assignment.
What is Dr. Vernissia Tam's MIPS score?
Dr. Tam's MIPS final score for performance year 2024 is 83 out of 100, reported as part of a group.
How many Medicare patients does Dr. Vernissia Tam see?
CMS counts 157 Medicare patients who saw Dr. Tam in 2024, with an average age of 75.
Show 4 more questionsShow fewer questions
What services does Dr. Vernissia Tam bill to Medicare?
In 2024, Dr. Tam's most billed Medicare services were surgery: digestive system (46600), office visit, established patient (99215) and office visit, new patient (99204).
What drugs does Dr. Vernissia Tam prescribe most?
In 2024 Medicare Part D data, Dr. Tam's most prescribed drugs by claims were Tramadol HCl, Gabapentin and Oxycodone HCl.
Has Dr. Vernissia Tam received payments from drug or device companies?
CMS Open Payments shows $764 in general payments to Dr. Tam from 8 companies from 2022 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Vernissia Tam been practicing?
Dr. Tam graduated from medical school in 2013, 13 years ago.
Selling to colon and rectal surgery practices?
See colorectal surgeons in Maryland 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