Hannah Nien, M.D.

Primary specialty

Diagnostic Radiology PhysicianTaxonomy code 2085R0202X

License

A131459 Issued in CA

Practice address

20929 Hawthorne Blvd
PLCM Women'S Imaging Center
Torrance, CA 90503

Phone

(617) 818-2232

NPI assigned

Jun 8, 2009

Sex

Female

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

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

Diagnostic Radiology

Education

Tufts University School of Medicine, 2009

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Moran Rowen and Dorsey IncGroup PAC ID 9537063375, 35 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Providence Mission Hospital Hospital, Mission Viejo, CA, CCN 050567

Merit-based Incentive Payment System (MIPS)

Final score

96.76 of 100Reported as group

Quality

91.7

Improvement activities

40

Merit-based Incentive Payment System (MIPS)

Final score

84.56 of 100Reported as group

Quality

85.63

Improvement activities

40

Cost

74.88

Medicare enrollment (NPD)

Not enrolled

HHS exclusion list flag

Flagged The directory lists this NPI on an HHS exclusion list. The OIG exclusions file (LEIE) holds no record for this NPI, and the directory does not say which list the flag comes from. How exclusions are shown Confirm with the OIG exclusions search.

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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.

• Moran Rowen and Dorsey Inc

  • Diagnostic Radiology Physician
  • Orange, CA
  • NPI 1649263906
  Medicare reassignment Care Compare group NPD

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

• Mission Hospital Regional Medical Center

  • General Acute Care Hospital
  • Mission Viejo, CA
  • NPI 1912108002
  Care Compare affiliation
• Mission Hospital Regional Medical Center

  • General Acute Care Hospital
  • Mission Viejo, CA
  • NPI 1992752315
  Care Compare affiliation

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

{
    "created_epoch": "1244419200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1789689600000",
    "number": "1417183203",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "21213B HAWTHORNE BLVD # 5111",
            "city": "TORRANCE",
            "state": "CA",
            "postal_code": "905035501"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "20929 HAWTHORNE BLVD",
            "address_2": "PLCM WOMEN'S IMAGING CENTER",
            "city": "TORRANCE",
            "state": "CA",
            "postal_code": "90503",
            "telephone_number": "617-818-2232"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "28881 Airoso St",
            "address_purpose": "LOCATION",
            "city": "Rancho Mission Viejo",
            "state": "CA",
            "postal_code": "926942486",
            "country_code": "US",
            "telephone_number": "949-682-2600",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "NIEN",
        "first_name": "HANNAH",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2009-06-08",
        "last_updated": "2026-09-18",
        "certification_date": "2026-09-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "CA",
            "license": "A131459",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Dalton Nielsen, DPT
• Julie Ann Nielsen, HAD
• Katherine Nielsen
• Riza Grace Nielsen, NP
• James Niemann, M.D.
• Yih-Lin Nien, M.D.
• Elijah Michael Nienaber
• Kenneth M Nies, M.D.
• Elaine Vanda Nieves, MSW
• Jane Nightengale, FNP

• Diagnostic Radiology Physician in Torrance, CA
• Providers in Torrance, CA by specialty
• Diagnostic Radiology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 18, 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.