Joshua Greenstein, M.D.

Primary specialty

Nephrology PhysicianTaxonomy code 207RN0300X

License

A68100 Issued in CA

Practice address

1955 Citracado Pkwy Ste 301
Escondido, CA 92029-4113

Phone

(760) 294-1660

Fax

(760) 745-5016

NPI assigned

Apr 19, 2006

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

Other identifiers 3

Medicare fee-for-service enrollment

Enrolled in CA

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.

Enrollment records 1

Specialty

Nephrology

Education

Other, 1998

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Balboa Nephrology Medical Group Inc 78 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• DaVita Hidden Valley Dialysis facility, Escondido, CA, CCN 752514
• DaVita San Marcos Dialysis Center Dialysis facility, San Marcos, CA, CCN 552618
• DaVita Escondido Dialysis Dialysis facility, Escondido, CA, CCN 052525
• Palomar Health Downtown Campus Hospital, Escondido, CA, CCN 050115
• Palomar Medical Center Poway Hospital, Poway, CA, CCN 050636

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles (6 of 7)

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: jgreenstein81073@scrippshlth.medalliesdirect.net
• Direct secure messaging: jgreenstein10409@direct.acumenmd.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Balboa Nephrology Medical Group, Inc.

  • Nephrology Physician
  • San Diego, CA
  • NPI 1316997505

  CA, Nephrology

  Medicare reassignment Care Compare group NPD
• Balboa Nephrology Medical Group,Inc.

  • Ambulatory Surgical Clinic/Center
  • San Diego, CA
  • NPI 1598276404
  NPD
• Scripps Health

  • General Acute Care Hospital
  • San Diego, CA
  • NPI 1487928891
  NPD
• Jenness Dialysis LLC

  • End-Stage Renal Disease (ESRD) Treatment Clinic/Center
  • Escondido, CA
  • NPI 1215443411
  NPD (past)
• Palomar Health

  • General Acute Care Hospital
  • Escondido, CA
  • NPI 1457321317
  NPD (past)
• The University of Chicago Medical Centers

  • Children's Hospital
  • Chicago, IL
  • NPI 1093894990
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Dva Renal Healthcare Inc

  • End-Stage Renal Disease (ESRD) Treatment Clinic/Center
  • Escondido, CA
  • NPI 1902870298

  Dialysis facility

  Care Compare affiliation Name & address match
• Jenness Dialysis LLC

  • End-Stage Renal Disease (ESRD) Treatment Clinic/Center
  • Escondido, CA
  • NPI 1215443411

  Dialysis facility

  Care Compare affiliation Name & address match
• San Marcos Dialysis LLC

  • End-Stage Renal Disease (ESRD) Treatment Clinic/Center
  • San Marcos, CA
  • NPI 1255506036

  Dialysis facility

  Care Compare affiliation Name & address match
• Palomar Health

  • General Acute Care Hospital
  • Poway, CA
  • NPI 1376513754

  Hospital

  Care Compare affiliation
• Palomar Health

  • General Acute Care Hospital
  • Escondido, CA
  • NPI 1457321317

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1145404800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768521600000",
    "number": "1104881457",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "9373 HAZARD WAY STE 200",
            "address_2": "STE 200",
            "city": "SAN DIEGO",
            "state": "CA",
            "postal_code": "921231226",
            "telephone_number": "858-810-0000",
            "fax_number": "858-268-1911"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1955 CITRACADO PKWY STE 301",
            "city": "ESCONDIDO",
            "state": "CA",
            "postal_code": "920294113",
            "telephone_number": "760-294-1660",
            "fax_number": "760-745-5016"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GREENSTEIN",
        "first_name": "JOSHUA",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-04-19",
        "last_updated": "2026-01-16",
        "certification_date": "2026-01-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RN0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Nephrology",
            "state": "CA",
            "license": "A68100",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "ORANGE COUNTY PTAN",
            "identifier": "CB258825",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "NO CA PTAN",
            "identifier": "CA205056",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "SO CA PTAN",
            "identifier": "G0998Z",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Green Touch Acupuncture Inc
• Jason Green
• Jason Richard Green
• Malachi Green, ATC
• Jack Greenspun
• Lewis Richard Greenstein, M.D.
• Greer Savin MDS Inc
• Nelly Gregorian-Deleon, LMFT
• Anne Gregorio, LCSW
• Emily Claire Gremett, PT, DPT

• All providers in Escondido, CA
• Nephrology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 16, 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.