NPIMap

Individual provider Active NPI

Mark D Shields, MD

  • Internal Medicine Physician
  • Laguna Hills, CA
National Provider Identifier
1366411555
Registry record updated Nov 28, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
G77342 Issued in CA
Practice address
24221 Calle de la Louisa
Suite 200
Laguna Hills, CA 92653-7638
Phone
(949) 588-8700
Fax
(949) 465-8159
NPI assigned
Mar 17, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Nov 28, 2025

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X G77342 CA Primary

Addresses

Primary practice location

24221 Calle de la Louisa
Suite 200
Laguna Hills, CA 92653-7638

Mailing address

PO Box 35380
Las Vegas, NV 89133-5380
Phone (702) 579-3203

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20100105000241 CA Practitioner - Internal Medicine 8820066814 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
University of California, Geffen School of Medicine, 1992
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Saddleback Medical Group IncGroup PAC ID 5092606905, 27 clinicians
Paloma Medical Group IncGroup PAC ID 5193821908, 18 clinicians

Practice addresses (Care Compare)

24221 Calle de la Louisa
Laguna Hills, CA 92653-3642
Phone (949) 465-8155

24411 Health Ctr Dr
Suite 460
Laguna Hills, CA 92653-3687
Phone (949) 443-4303

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
87.45 of 100Reported as individual
Quality
85.34
Promoting interoperability
93
Improvement activities
40
Cost
78.67

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
77342CAMDPharmacist

Practice roles

OrganizationSpecialtyStatusNew patients
Healthcare Partners Affiliates Medical Group CurrentSince Sep 1, 2025 Accepting new patients
Saddleback Medical Group Inc CurrentSince Feb 1, 1999 Accepting new patients
Healthcare Partners Affiliates Medical Group Internal Medicine CurrentSince Sep 1, 2025 Accepting new patients
Saddleback Memorial Medical Center Past Accepting new patients
Memorial Medical Group Inc Past Accepting new patients
Pasadena Hospital Association, LTD. Past Accepting new patients

Locations

1236 N Magnolia Ave
Anaheim, CA 92801
Phone (714) 995-1000

5957 W Ramsey St
Banning, CA 92220
Phone (951) 845-8864

2910 Jefferson St
Ste 100
Carlsbad, CA 92008
Phone (760) 729-8600

824 E Carson St
Ste 104
Carson, CA 90745
Phone (310) 830-9706

24221 Calle de la Louisa
Ste 200
Laguna Hills, CA 92653
Phone (949) 465-8155

24221 Calle de la Louisa
Ste 400
Laguna Hills, CA 92653
Phone (949) 465-8155

23961 Calle de la Magdalena
Ste 130
Laguna Hills, CA 92653
Phone (949) 588-8700

24221 Calle de la Louisa
Laguna Hills, CA 92653

24411 Health Center Dr
Ste 460
Laguna Hills, CA 92653
Phone (949) 373-7799

1700 N Waterman Ave
Sn Bernrdno, CA 92404
Phone (909) 883-8611

Networks

  • BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

  • Direct secure messaging: mark.shields.p15@direct.monarchhealthcare.nextgenshare.com
  • Direct secure messaging: mshields195174@westdirect.optum.com

Organizations & group practices 7

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.

Hospital & facility affiliations 3

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

NPI Registry JSON

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

{
    "created_epoch": "1142553600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1764288000000",
    "number": "1366411555",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 35380",
            "city": "LAS VEGAS",
            "state": "NV",
            "postal_code": "891335380",
            "telephone_number": "702-579-3203"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "24221 CALLE DE LA LOUISA",
            "address_2": "SUITE 200",
            "city": "LAGUNA HILLS",
            "state": "CA",
            "postal_code": "926537638",
            "telephone_number": "949-588-8700",
            "fax_number": "949-465-8159"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SHIELDS",
        "first_name": "MARK",
        "middle_name": "D",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-17",
        "last_updated": "2025-11-28",
        "certification_date": "2025-11-28",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "G77342",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Laguna Hills, CA

Sources for this page

Verify at the official NPI Registry.