Karl Vance Sitz, M.D.
Allergy & Immunology (Internal Medicine) Physician · Little Rock, AR
Karl Vance Sitz, M.D. is an allergy & immunology (internal medicine) physician with a practice address in Little Rock, Arkansas, and NPI 1518959691, issued on Aug 16, 2005. Check the license (Arkansas C7148, as entered in NPPES) on the Arkansas State Medical Board; the Medicare figures below come from public CMS files.
- Name
- Karl Vance Sitz
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology (Internal Medicine) Physician 207RA0201X
- License number
- C7148 AR
Self-reported in NPPES; status is on the state search - Practice location
- 18 Corporate Hill Drive, Little Rock, AR 72205
- Phone
- (501) 224-1156
- Enumerated
- Aug 16, 2005
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (501) 801-5561
- Entity
- Type 1 · individual
Also registered at 18 Corporate Hill Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Blake Scheer, M.D.Allergy & Immunology (Internal Medicine) Physician1871585950
Verify Karl Vance Sitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArkansas State Medical Board
Search for license C7148Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average allergy & immunology (internal medicine) physician in 2024
141 Medicare Part D claims for 58 beneficiaries, against an average of 789 among the 429 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Azelastine Hcl29 claims
- Ipratropium Bromide18 claims
- Fluticasone Propionate13 claims
- Trelegy Ellipta12 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 practice group's MIPS final score for 2023 (Medicare payment program): 83.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $4,115.96
14 payments; by number, the most common kind was food and beverage; the largest payer was Csl Behring. The 321 providers of this specialty with any payment received $7,456.30 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.
Allergy & Immunology (Internal Medicine) Physician providers in Arkansas
There are 6 allergy & immunology (internal medicine) physician records in Arkansas.
Other allergy & immunology (internal medicine) physician records in Arkansas
- Stacy Griffin, M.D.Little Rock, AR1407892805
- Kim Ngan Jackson, MDLittle Rock, AR1902292329
- Blake Scheer, M.D.Little Rock, AR1871585950
- Charles Sisco, M.D.Fayetteville, AR1124021639
- Ashley Stoner, M.D.Little Rock, AR1497118814
Common questions
What is Karl Vance Sitz, M.D.'s NPI number?
Karl Vance Sitz, M.D.'s National Provider Identifier (NPI) is 1518959691, issued on Aug 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Karl Vance Sitz, M.D. located?
The NPPES record lists a practice address at 18 Corporate Hill Drive, Little Rock, AR, 72205. Phone: (501) 224-1156. Providers update this record themselves, so call before visiting.
How can I verify Karl Vance Sitz, M.D.'s license?
NPPES lists Arkansas license number C7148, as entered by the provider. Search the Arkansas State Medical Board at https://armedicalboard.adh.arkansas.gov/public/verify/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Karl Vance Sitz, M.D. prescribe under Medicare Part D?
In 2024, Karl Vance Sitz, M.D. had 141 Medicare Part D claims for 58 beneficiaries; the average among allergy & immunology (internal medicine) physician prescribers was 789. Part D covers Medicare prescriptions only.
What is Karl Vance Sitz, M.D.'s MIPS final score?
The 2023 MIPS final score is 83.2 of 100, reported for the practice group. 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.