Cristian Zhang Xu, M.D.
Sleep Medicine (Internal Medicine) Physician · Middletown, DE
Cristian Zhang Xu, M.D. is a sleep medicine (internal medicine) physician with a practice address in Middletown, Delaware, and NPI 1376287987, issued on Apr 21, 2022. Check the license (Delaware C1-0029358, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Cristian Zhang Xu
- Credential
- M.D.
- Primary taxonomy
- Sleep Medicine (Internal Medicine) Physician 207RS0012X
- License number
- C1-0029358 DE
Self-reported in NPPES; status is on the state search - Practice location
- 209 E Main St Ste 3, Middletown, DE 19709
- Phone
- (302) 464-3967
- Enumerated
- Apr 21, 2022
- Record last updated
- May 13, 2026
- Fax
- (302) 464-3968
- Entity
- Type 1 · individual
4 nearest sleep medicine (internal medicine) physician records → All 5 in Delaware → Look up another NPI →
Also registered at 209 E Main St Ste 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sara Parisi, M.D.Family Medicine Physician1043906779
Verify Cristian Zhang Xu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDelaware Board of Medical Licensure and Discipline
Search for license C1-0029358Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024
326 Medicare Part D claims for 57 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Atorvastatin Calcium26 claims
- Metformin Hcl26 claims
- Jardiance23 claims
- Alcohol Prep Pads12 claims
- Metoprolol Succinate12 claims
- Omeprazole12 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.
Sleep Medicine (Internal Medicine) Physician providers in Delaware
There are 5 sleep medicine (internal medicine) physician records in Delaware.
All 5 in Delaware → Every provider in Middletown → Sleep Medicine (Internal Medicine) Physician nationwide →
The 4 sleep medicine (internal medicine) physician records with the nearest ZIP codes
- Christina Lee, MDNewark, DE 197131467912014
- Anthony Vasile, D.O.Newark, DE 197131821071820
- John Coll, DODover, DE 199011265439582
- Sherin Howett, DOMillsboro, DE 199661114144516
Common questions
What is Cristian Zhang Xu, M.D.'s NPI number?
Cristian Zhang Xu, M.D.'s National Provider Identifier (NPI) is 1376287987, issued on Apr 21, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Cristian Zhang Xu, M.D. located?
The NPPES record lists a practice address at 209 E Main St Ste 3, Middletown, DE, 19709. Phone: (302) 464-3967. Providers update this record themselves, so call before visiting.
How can I verify Cristian Zhang Xu, M.D.'s license?
NPPES lists Delaware license number C1-0029358, as entered by the provider. Search the Delaware Board of Medical Licensure and Discipline at https://delpros.delaware.gov/OH_VerifyLicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cristian Zhang Xu, M.D. prescribe under Medicare Part D?
In 2024, Cristian Zhang Xu, M.D. had 326 Medicare Part D claims for 57 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.