Cristian Zhang Xu, M.D.

Primary specialty

Sleep Medicine (Internal Medicine) PhysicianTaxonomy code 207RS0012X

License

C1-0029358 Issued in DE

Practice address

209 E Main St Ste 3
Middletown, DE 19709-1449

Phone

(302) 464-3967

Fax

(302) 464-3968

NPI assigned

Apr 21, 2022

Reactivated

Feb 23, 2023

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Specialty

Sleep Medicine

Education

Other, 2019

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1650499200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778630400000",
    "number": "1376287987",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "640 S STATE ST # MC3055",
            "city": "DOVER",
            "state": "DE",
            "postal_code": "199013530",
            "telephone_number": "302-464-3967",
            "fax_number": "302-464-3968"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "209 E MAIN ST STE 3",
            "city": "MIDDLETOWN",
            "state": "DE",
            "postal_code": "197091449",
            "telephone_number": "302-464-3967",
            "fax_number": "302-464-3968"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ZHANG XU",
        "first_name": "CRISTIAN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-04-21",
        "last_updated": "2026-05-13",
        "certification_date": "2026-05-13",
        "deactivation_date": "2023-01-18",
        "reactivation_date": "2023-02-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RS0012X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Sleep Medicine",
            "state": "DE",
            "license": "C1-0029358",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Felicite Kounga Yankam, PMHNP
• Melissa Renee Yankwitt, BCBA
• Tara E Yerkes, O.D.
• Daniel Yermal
• Seungho You, DPT
• Peter Zorach, M.D.

• Sleep Medicine (Internal Medicine) Physician in Middletown, DE
• Providers in Middletown, DE by specialty
• Sleep Medicine (Internal Medicine) Physician in Delaware

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.