Dr. Mark A. Vierra, MD

  • Carmel, CA
  • General surgeon
NPI1295706448PAC ID4082607189
Medicare services, 2024
722
Medicare patients, 2024
400
Part D claims, 2024
351
Publications
20
MIPS score, 2024
87
Practice address
275 Crossroads Blvd, Carmel, CA 93923
Practice phone
Call (831) 658-3639
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Montage Medical Group

Carmel, California

See all 7 affiliations

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Dr. Mark A. Vierra is a general surgeon in Carmel, California

Dr. Vierra practices at Montage Medical Group in Carmel, California.

Dr. Vierra's NPI, 1295706448, was assigned on January 27, 2006. Dr. Vierra graduated from Harvard Medical School in 1985. Dr. Vierra holds California license G59649.

NPI and contact details
Medicare PAC ID
4082607189
NPI enumeration date
January 27, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(831) 658-3639
Professional email
Get email
Personal email
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Mobile number
Get number
Sex
Male
Estimated age
67
Medical school graduation
1985

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Mark A. Vierra practices at Montage Medical Group in Carmel, California

Dr. Vierra's primary practice is Montage Medical Group, at 275 Crossroads Blvd, Carmel, CA 93923 in Monterey County. The practice phone is (831) 658-3639.

  • Montage Medical Group
    275 Crossroads Blvd, Carmel, CA 93923 · Monterey CountyPhone(831) 658-3639

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Dr. Mark A. Vierra is affiliated with 5 sites of care and 2 medical groups

Dr. Vierra's primary practice is Montage Medical Group in Carmel, California. Dr. Vierra is also affiliated with Community Hospital of the Monterey Peninsula. The medical group on file is Montage Medical Group. Dmand AI also links Dr. Vierra to 1 more hospital, 2 group practices and clinics and 1 medical group, each named with a free account.

See all 7 affiliations for Dr. Vierra

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data

Dmand AI tracks the EHR system at Dr. Mark A. Vierra's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Vierra practices, 4 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Montage Medical GroupAvailable with a free account
+4 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Mark A. Vierra is one of 2,926 general surgeons in California

Surgery is Dr. Vierra's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Vierra's licenses on file in 2 states: California and Hawaii.

Specialties and state licenses

  • Surgery, CaliforniaPrimaryLicense G59649 · 1987 to 2026 · taxonomy 208600000X
  • Hawaii license1988 to 1990

Clinical focus

Dmand AI lists abdominal hernia repair surgery, bariatric surgery, colonoscopy, colon removal, esophagus, stomach, or upper small intestine surgery, gallbladder removal, gastrointestinal bleeding and groin hernia surgery among the conditions Dr. Vierra treats.

General surgeons near Dr. Vierra

Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.

2,926general surgeons in California
2general surgeons in Carmel

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Mark A. Vierra billed Medicare for 722 services in 2024

CMS data shows 722 Medicare services from Dr. Vierra across 14 procedure codes in 2024, for 400 Medicare patients. Medicare paid $98,542 for them.

Medicare services, 2024722
Medicare patients400
Paid by Medicare$98,542
Procedure codes14

Dr. Vierra's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 6612024: 663No change
Surgery
2023: 162024: 46188%
Imaging
2023: 02024: 13

Where Dr. Vierra's Medicare services took place, 2024

  • In an office52673%
  • In a facility19627%

Dr. Vierra compared with the California median for general surgeons, 2024

  • Dr. Vierra
  • California median
Medicare services
722vs 1664.3 times
Medicare patients
400vs 1213.3 times
Part D claims
187vs 345.5 times

Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.

Dr. Vierra'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.

See all procedures by Dr. Vierra

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Mark A. Vierra treated 400 Medicare patients in 2024, average age 73

CMS counts 400 Medicare patients who saw Dr. Vierra in 2024. The largest group is 65 to 74, with 165 patients. 75% of them have high cholesterol, and 73% have high blood pressure. 22% are also on Medicaid. Their average risk score is 1.35, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Vierra's median patient age at 57, with 66% women.

Medicare patients, 2024400
Average age73
Average risk score1.35
Also on Medicaid22%

Dr. Vierra's Medicare patients by age, 2024

Dr. Vierra's Medicare patients by sex, 2024

  • Women23759%
  • Men16341%

Chronic conditions among Dr. Vierra's Medicare patients, 2024

  1. High cholesterol75%
  2. High blood pressure73%
  3. Arthritis49%
  4. Ischemic heart disease34%
  5. Diabetes31%
  6. Mood disorders30%
  7. Anxiety29%
  8. Depression27%

Share of Medicare patients with each condition. A patient can have several.

Dr. Vierra'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

  • Women66%
  • Men34%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Mark A. Vierra wrote 351 Medicare Part D claims in 2024

In 2024, Dr. Vierra wrote 351 Medicare Part D claims for 133 patients. 90% of them were for generic drugs. CMS names the drug for 187 of them, across 5 drugs with 11 or more claims each, at $17,649 in total drug cost. In 2023, CMS named 181 claims across 6 drugs.

Part D claims, 2024351
Drugs named by CMS5
Total drug cost$17,649
Part D patients133

Dr. Vierra's Part D claims by kind of drug, 2024

  • Generic317 claims90%
  • Brand-name34 claims10%

Dr. Vierra'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. Vierra's Part D claims, 2024

  • Opioids20%70 of 351 claims
  • Antibiotics14%49 of 351 claims
  • Antipsychotics, patients 65 and over6%22 of 351 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: 1812024: 1873%

Drugs named by CMS: 5 in 2024, 6 in 2023.

See all prescribing by Dr. Vierra

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. Mark A. Vierra scored 87 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Vierra for performance year 2024, reported as part of a group. Dr. Vierra accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Vierra as offering telehealth. CMS counts 19 procedures of hernia repair - groin (open) by Dr. Vierra, more than 96% of the clinicians it reports for that procedure.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Dr. Vierra's MIPS scores, performance year 2024

  • 87of 100Final score
  • 81.8of 100Quality
  • 100of 100Promoting Interoperability
  • 40of 100Improvement Activities
  • 73of 100Cost

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Where Dr. Vierra ranks in Medicare procedure volume

Upper gastrointestinal (GI) endoscopy for acid reflux
52nd percentile23 procedures
Hernia repair - groin (open)
96th percentile19 procedures
Hernia repair (minimally invasive)
85th percentile17 procedures

CMS ranks each clinician against every clinician it reports for the same procedure category.

Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)

Mastectomy: 1 to 10 procedures (CMS shows small counts as a range)

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

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Dr. Mark A. Vierra has 20 publications on record

Dmand AI links 20 papers to Dr. Vierra in 2010. The most frequent topics are Fluorouracil, Pancreatic Neoplasms and Receptors, Chemokine. Dr. Vierra has published most often in Int J Radiat Oncol Biol Phys. Dr. Vierra's most frequent co-authors are George A. Fisher, MD, Eugene Butcher, MD and James Matthew Ford, MD.

Papers20

Topics Dr. Vierra writes about most

  • Fluorouracil
  • Pancreatic Neoplasms
  • Receptors, Chemokine
  • Antimetabolites, Antineoplastic
  • Radiotherapy Dosage
  • Chemotherapy, Adjuvant
  • Infusions, Intravenous
  • Intestinal Mucosa

Dr. Vierra's most frequent co-authors

Recent publications by Dr. Vierra

See all 20 publications and co-authors

See who Dr. Vierra researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Vierra works with, so you can find a warm path to the right general surgeons.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Mark A. Vierra received $812 in industry payments from 2016 to 2022

CMS Open Payments shows 13 general payments to Dr. Vierra from 8 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. Allergan Inc. paid the most, $224.

General payments to Dr. Vierra by program year, 2016 to 2022

Companies that paid Dr. Vierra the most, 2016 to 2022

Share is of all general payments to this clinician.

See all payments to Dr. Vierra

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Mark A. Vierra has 2 awards and honors on record

Dmand AI lists 2 awards for Dr. Vierra, most recently CMS Stage 1 2012 in 2012.

Awards and honors for Dr. Vierra

  1. 2012
    • CMS Stage 1 2012
  2. Undated
    • ACS Fellow

Source: Dmand AI Professional Profile Data

Dr. Mark A. Vierra graduated from Harvard Medical School

Dr. Vierra graduated from Harvard Medical School in 1985. Dr. Vierra is a member of ACS.

  1. Medical schoolHarvard Medical School

Source: Dmand AI Professional Profile Data

Dr. Mark A. Vierra accepts plans from 7 insurance carriers

Dr. Vierra is in network with 7 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.

  • Blue Cross Blue Shield of Michigan
  • United Healthcare
  • Blue Cross Blue Shield of Massachusetts
  • HCSC
  • Humana
  • Regence Health Plans
  • CMS Medicare

Plan types Dr. Vierra accepts, by number of carriers

  1. Medicare7
  2. PPO6
  3. HMO2
  4. POS2

Source: Dmand AI Insurance Network Data

Sources for Dr. Mark A. Vierra's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare 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 percentilesDoctors 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)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Mark A. Vierra

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. Mark A. Vierra's NPI number?

Dr. Mark A. Vierra's NPI number is 1295706448. It was assigned on January 27, 2006, and it is active in the NPI Registry.

What kind of doctor is Dr. Mark A. Vierra?

Dr. Mark A. Vierra is a general surgeon in Carmel, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).

Where does Dr. Mark A. Vierra practice?

Dr. Vierra practices at 275 Crossroads Blvd, Carmel, CA 93923. Dr. Vierra's primary practice is Montage Medical Group in Carmel, California. Dmand AI also links Dr. Vierra to 1 hospital, 2 group practices and clinics and 1 medical group.

What is Dr. Mark A. Vierra's office phone number?

The practice phone on file for Dr. Vierra is (831) 658-3639.

What is Dr. Mark A. Vierra's medical license number?

Dr. Vierra holds California license G59649, one of the licenses on file in 2 states.

Which states has Dr. Mark A. Vierra been licensed in?

Dmand AI has state licenses on file for Dr. Vierra in California (1987 to 2026) and Hawaii (1988 to 1990).

Which hospitals is Dr. Mark A. Vierra affiliated with?

Dr. Vierra is affiliated with Community Hospital of the Monterey Peninsula. Dmand AI links Dr. Vierra to 1 more hospital.

What medical group is Dr. Mark A. Vierra part of?

Dr. Vierra is linked to Montage Medical Group. Dmand AI links Dr. Vierra to 1 more medical group.

Does Dr. Mark A. Vierra accept Medicare?

Yes. CMS data shows Dr. Vierra billed Medicare for 722 services in 2024, and Dr. Vierra accepts Medicare assignment.

Does Dr. Mark A. Vierra offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Vierra as offering telehealth services.

Show 10 more questionsShow fewer questions

What is Dr. Mark A. Vierra's MIPS score?

Dr. Vierra's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.

How many Medicare patients does Dr. Mark A. Vierra see?

CMS counts 400 Medicare patients who saw Dr. Vierra in 2024, with an average age of 73.

What services does Dr. Mark A. Vierra bill to Medicare?

In 2024, Dr. Vierra's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, new patient (99204).

Where did Dr. Mark A. Vierra go to medical school?

Dr. Vierra graduated from Harvard Medical School in 1985.

What drugs does Dr. Mark A. Vierra prescribe most?

In 2024 Medicare Part D data, Dr. Vierra's most prescribed drugs by claims were Pantoprazole Sodium, Tramadol HCl and Amoxicillin-Clavulanate Potass.

Has Dr. Mark A. Vierra received payments from drug or device companies?

CMS Open Payments shows $812 in general payments to Dr. Vierra from 8 companies from 2016 to 2022. The largest total came from Allergan Inc.

How long has Dr. Mark A. Vierra been practicing?

Dr. Vierra graduated from medical school in 1985, 41 years ago.

Does Dr. Mark A. Vierra do research?

Dmand AI links 20 publications to Dr. Vierra.

Who does Dr. Mark A. Vierra publish with?

Dr. Vierra's most frequent co-authors are George A. Fisher, MD (6 shared papers), Eugene Butcher, MD (5 shared papers) and James Matthew Ford, MD (4 shared papers).

What insurance does Dr. Mark A. Vierra accept?

Dr. Vierra is in network with 7 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.

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