Krystina E. Callahan, MD
Neurology Physician · Charleston, SC
Krystina E. Callahan, MD is a neurology physician with a practice address in Charleston, South Carolina, and NPI 1770214546, issued on Jun 22, 2022. Check the license (South Carolina LL88265, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Krystina E. Callahan
- Credential
- MD
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- LL88265 SC
Self-reported in NPPES; status is on the state search - Practice location
- 169 Ashley Ave, Charleston, SC 29425
- Phone
- (843) 792-3221
- Enumerated
- Jun 22, 2022
- Record last updated
- Jun 22, 2022
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 326 in South Carolina → Look up another NPI →
Also registered at 169 Ashley Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Krystina E. Callahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license LL88265Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average neurology physician in 2024
152 Medicare Part D claims for 37 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Pregabalin20 claims
- Atorvastatin Calcium17 claims
- Nurtec Odt15 claims
- Donepezil Hcl12 claims
- Gabapentin12 claims
- Topiramate11 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.
Krystina E. Callahan among 326 neurology physician records in South Carolina
Krystina E. Callahan, MD is one of 326 neurology physician records with a practice address in South Carolina. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 76% of them.
- NPI issued2022 · 76% of these records are older, 20% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2022 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurology Physician providers in South Carolina
There are 326 neurology physician records in South Carolina.
All 326 in South Carolina → Every provider in Charleston → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- Robert Adams, MDCharleston, SC 294251003919911
- David Bachman, MDCharleston, SC 294251043253057
- Kenneth Bergmann, MDCharleston, SC 294251598709057
- Marc Chimowitz, M.D.Charleston, SC 294251043326044
- Jonathan Edwards, MDCharleston, SC 294251619066586
- Jonathan Halford, MDCharleston, SC 294251346284726
- Vanessa Hinson, MD, PHDCharleston, SC 294251114967908
- Jerome Kurent, MDCharleston, SC 294251427154657
Common questions
What is Krystina E. Callahan, MD's NPI number?
Krystina E. Callahan, MD's National Provider Identifier (NPI) is 1770214546, issued on Jun 22, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Krystina E. Callahan, MD located?
The NPPES record lists a practice address at 169 Ashley Ave, Charleston, SC, 29425. Phone: (843) 792-3221. Providers update this record themselves, so call before visiting.
How can I verify Krystina E. Callahan, MD's license?
NPPES lists South Carolina license number LL88265, as entered by the provider. Search the South Carolina Board of Medical Examiners at https://verify.llronline.com/LicLookup/Med/Med.aspx?div=22. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Krystina E. Callahan, MD prescribe under Medicare Part D?
In 2024, Krystina E. Callahan, MD had 152 Medicare Part D claims for 37 beneficiaries; the average among neurology physician prescribers was 1,370. 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.