Ann S. Mercer, M.D.
Internal Medicine Physician · Las Cruces, NM
Ann S. Mercer, M.D. is an internal medicine physician with a practice address in Las Cruces, New Mexico, and NPI 1811913502, issued on Jul 14, 2006. Check the license (New Mexico 84-79, as entered in NPPES) on the New Mexico Medical Board; the Medicare figures below come from public CMS files.
- Name
- Ann S. Mercer
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 84-79 NM
Self-reported in NPPES; status is on the state search - Practice location
- 2801 Missouri Ave, Las Cruces, NM 88011
- Phone
- (575) 522-6900
- Enumerated
- Jul 14, 2006
- Record last updated
- Mar 15, 2022
- Medicaid ID
- 33407 NM
- Medicare enrollment
- Enrolled (PECOS I20050720000494); accepts Medicare assignment
- Medical or professional school
- University Of Puerto Rico School Of Medicine, 1978
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 770 in New Mexico → Look up another NPI →
Also registered at 2801 Missouri Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Heather Barraza, APRNNurse Practitioner1679241657
- Liza BaumanCommunity Health Worker1083347512
- Laura Carsner, D.C.Chiropractor1497878912
- Hernan CiudadPediatrics Physician1417031840
- Katherine Emerick, CNPFamily Nurse Practitioner1154618411
- Henry GarciaCommunity Health Worker1194319020
Verify Ann S. Mercer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Mexico Medical Board
Search for license 84-79Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% more Medicare Part D claims than the average internal medicine physician in 2024
5,601 Medicare Part D claims for 334 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 147 claims were for opioids.
Most prescribed
- Losartan Potassium301 claims
- Levothyroxine Sodium289 claims
- Lisinopril188 claims
- Amlodipine Besylate184 claims
- Gabapentin153 claims
- Furosemide147 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 88.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $910.53
39 payments; by number, the most common kind was food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Ann S. Mercer among 770 internal medicine physician records in New Mexico
Ann S. Mercer, M.D. is one of 770 internal medicine physician records with a practice address in New Mexico. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 57% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1978 · median 2009 among the 447 with a school on file
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Mexico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
52 internal medicine physician records list a practice address in Las Cruces
They are 52 of the 5,468 NPPES records with a practice address in Las Cruces, and 770 internal medicine physician records in New Mexico.
All 770 in New Mexico → Every provider in Las Cruces → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Francis Attiogbe, M.D.Las Cruces, NM 880111457346652
- Harry BassLas Cruces, NM 880111952398364
- Michael Bell, M.D.Las Cruces, NM 880111851397723
- Louis Benevento, MDLas Cruces, NM 880111063445666
- Angelica Caglia, MDLas Cruces, NM 880111861486201
- Virginia Corpus, MD, FACPLas Cruces, NM 880111144225160
- John Glick, M.D.Las Cruces, NM 880111811904337
- Ernest JabourLas Cruces, NM 880111306815691
Common questions
What is Ann S. Mercer, M.D.'s NPI number?
Ann S. Mercer, M.D.'s National Provider Identifier (NPI) is 1811913502, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ann S. Mercer, M.D. located?
The NPPES record lists a practice address at 2801 Missouri Ave, Las Cruces, NM, 88011. Phone: (575) 522-6900. Providers update this record themselves, so call before visiting.
How can I verify Ann S. Mercer, M.D.'s license?
NPPES lists New Mexico license number 84-79, as entered by the provider. Search the New Mexico Medical Board at https://www.nmmb.state.nm.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ann S. Mercer, M.D. prescribe under Medicare Part D?
In 2024, Ann S. Mercer, M.D. had 5,601 Medicare Part D claims for 334 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Ann S. Mercer, M.D.'s MIPS final score?
The 2023 MIPS final score is 88.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.