Charles Calais, D.O
Allergy & Immunology (Internal Medicine) Physician · San Antonio, TX
Charles Calais, D.O is an allergy & immunology (internal medicine) physician with a practice address in San Antonio, Texas, and NPI 1831416197, issued on Apr 27, 2010. Check the license (Texas R8534, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Charles Calais
- Credential
- D.O
- Primary taxonomy
- Allergy & Immunology (Internal Medicine) Physician 207RA0201X
- License numbers
- R8534 TX
0102203064 VA
Self-reported in NPPES; status is on the state search - Practice location
- 1219 Mccullough Ave, San Antonio, TX 78212
- Phone
- (210) 226-3500
- Enumerated
- Apr 27, 2010
- Record last updated
- Jan 20, 2025
- Fax
- (210) 226-3638
- Medicare enrollment
- Enrolled (PECOS I20200706001672); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2010
- Entity
- Type 1 · individual
8 nearest allergy & immunology (internal medicine) physician records → All 50 in Texas → Look up another NPI →
Verify Charles Calais in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license R8534Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% more Medicare Part D claims than the average allergy & immunology (internal medicine) physician in 2024
1,095 Medicare Part D claims for 174 beneficiaries, against an average of 789 among the 429 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone125 claims
- Famotidine124 claims
- Hydroxyzine Hcl73 claims
- Azelastine Hcl67 claims
- Fluticasone Propionate65 claims
- Triamcinolone Acetonide61 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.
Industry payments in 2024: $1,893.33
55 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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.
Charles Calais among 50 allergy & immunology (internal medicine) physician records in Texas
Charles Calais, D.O is one of 50 allergy & immunology (internal medicine) physician records with a practice address in Texas. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 66% of them.
- NPI issued2010 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated2010 · median 2003 among the 38 with a school on file
- Record last updated2025 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RA0201X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology (Internal Medicine) Physician providers in Texas
There are 50 allergy & immunology (internal medicine) physician records in Texas.
All 50 in Texas → Every provider in San Antonio → Allergy & Immunology (Internal Medicine) Physician nationwide →
The 8 allergy & immunology (internal medicine) physician records with the nearest ZIP codes
- Michael Adame, MDSan Antonio, TX 782291730742214
- James Quinn, M.D.Fort Sam Houston, TX 782341851325237
- Alan Boyar, M.D.San Antonio, TX 782451295728038
- Rigoberto Acosta, M.D.College Station, TX 778451912024274
- Karim Dhanani, MDRound Rock, TX 786651912106154
- Michael Volz, M.D.Austin, TX 787171841225430
- Elisabeth Clayton, MDAustin, TX 787311538435532
- Narendra Punjabi, MDAustin, TX 787591295740751
Common questions
What is Charles Calais, D.O's NPI number?
Charles Calais, D.O's National Provider Identifier (NPI) is 1831416197, issued on Apr 27, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Charles Calais, D.O located?
The NPPES record lists a practice address at 1219 Mccullough Ave, San Antonio, TX, 78212. Phone: (210) 226-3500. Providers update this record themselves, so call before visiting.
How can I verify Charles Calais, D.O's license?
NPPES lists Texas license number R8534, 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 Charles Calais, D.O prescribe under Medicare Part D?
In 2024, Charles Calais, D.O had 1,095 Medicare Part D claims for 174 beneficiaries; the average among allergy & immunology (internal medicine) physician prescribers was 789. Part D covers Medicare prescriptions only.
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.