Isaac Arthur Loose, M.D.
Retina Specialist (Ophthalmology) Physician · Austin, TX
Isaac Arthur Loose, M.D. is a retina specialist (ophthalmology) physician with a practice address in Austin, Texas, and NPI 1821075664, issued on Dec 22, 2005. Check the license (Texas H4498, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Isaac Arthur Loose
- Credential
- M.D.
- Primary taxonomy
- Retina Specialist (Ophthalmology) Physician 207WX0107X
- License number
- H4498 TX
Self-reported in NPPES; status is on the state search - Practice location
- 5717 Balcones Dr, Austin, TX 78731
- Phone
- (512) 327-7000
- Enumerated
- Dec 22, 2005
- Record last updated
- Jan 3, 2024
- Fax
- (512) 314-1660
- Medicare enrollment
- Enrolled (PECOS I20091207000719); accepts Medicare assignment
- Medical or professional school
- University Of Texas Southwestern Medical School At Dallas, 1987
- Entity
- Type 1 · individual
Also registered at 5717 Balcones Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kyla Aschenbeck, MDOphthalmology Physician1982091674
- Angeline Derham, MDOphthalmology Physician1255795217
- Tanya Khan, M.D.Ophthalmic Plastic and Reconstructive Surgery Physician1114242922
- Jeffery Lane, O.D.Optometrist1285619932
- William Lipham, M.D.Ophthalmic Plastic and Reconstructive Surgery Physician1528053717
- Robert Marquis, M.D., PH.D.Glaucoma Specialist (Ophthalmology) Physician1902881048
Verify Isaac Arthur Loose in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license H4498Check 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% fewer Medicare Part D claims than the average retina specialist (ophthalmology) physician in 2024
149 Medicare Part D claims for 59 beneficiaries, against an average of 620 among the 1,449 providers of this specialty who prescribed in Part D. Brand-name drugs were 49% of claims.
Most prescribed
- Prednisolone Acetate69 claims
- Moxifloxacin23 claims
- Ofloxacin15 claims
- Ketorolac Tromethamine14 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): 92.8 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: $638.56
17 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. The 1,253 providers of this specialty with any payment received $7,667.49 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.
Bills Medicare through one group practice
- Texan Eye, PAAustin, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Retina Specialist (Ophthalmology) Physician providers in Texas
There are 107 retina specialist (ophthalmology) physician records in Texas.
Other retina specialist (ophthalmology) physician records in Texas
- Musa Abdelaziz, MDSouthlake, TX1588906465
- Matthew Adams, MDPlano, TX1124361076
- Mehreen Adhi, M.D.Pearland, TX1316333974
- Sanjay Agarwal, M.D.Corpus Christi, TX1871575688
- Abumere Akinwale, MDSan Antonio, TX1083871818
- John Alappatt, M.D.Houston, TX1568409688
- Rashed AlhabshanCorpus Christi, TX1811316680
- Marcus Allen, MDDallas, TX1164481297
- Erica Alvarez Gonzalez, M.D.El Paso, TX1255773313
- Bryan Angle, MDCorpus Christi, TX1457323537
Common questions
What is Isaac Arthur Loose, M.D.'s NPI number?
Isaac Arthur Loose, M.D.'s National Provider Identifier (NPI) is 1821075664, issued on Dec 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Isaac Arthur Loose, M.D. located?
The NPPES record lists a practice address at 5717 Balcones Dr, Austin, TX, 78731. Phone: (512) 327-7000. Providers update this record themselves, so call before visiting.
How can I verify Isaac Arthur Loose, M.D.'s license?
NPPES lists Texas license number H4498, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Isaac Arthur Loose, M.D. prescribe under Medicare Part D?
In 2024, Isaac Arthur Loose, M.D. had 149 Medicare Part D claims for 59 beneficiaries; the average among retina specialist (ophthalmology) physician prescribers was 620. Part D covers Medicare prescriptions only.
What is Isaac Arthur Loose, M.D.'s MIPS final score?
The 2023 MIPS final score is 92.8 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.