NPIMap

Individual provider Active NPI

Sasha Alexandra Underwood

  • Anesthesiology Physician
  • Miami, FL
National Provider Identifier
1285194068
Registry record updated Apr 1, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Anesthesiology PhysicianTaxonomy code 207L00000X
License
ME165997 Issued in FL
Practice address
1611 NW 12TH Ave # C300
Miami, FL 33136-1005
Phone
(303) 585-1111
NPI assigned
Mar 20, 2019
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Apr 1, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Anesthesiology Physician 207L00000X MD224333 OR
Anesthesiology Physician 207L00000X ME165997 FL Primary

Addresses

Primary practice location

1611 NW 12TH Ave # C300
Miami, FL 33136-1005

Mailing address

1611 NW 12TH Ave # C300
Miami, FL 33136-1005

Other practice location 1

3181 SW Sam Jackson Park Rd
Portland, OR 97239-3011
Phone (503) 494-7641

Other identifiers 1

IdentifierTypeStateIssuer
TRN29121OtherFLFLORIDA DEPARTMENT OF HEALTH LICENSE NUMBER

Other names 1

  • Stuart James Huizenga Van Der Greeff Former name

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA, FL, WV, OR4 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 4

Enrollment IDStateProvider typePAC IDDetails
I20230713002290 CA Practitioner - Anesthesiology 2466812128 Reassigns benefits to 1 organization
I20240206000811 FL Practitioner - Anesthesiology 2466812128 Reassigns benefits to 1 organization
I20241219000789 WV Practitioner - Anesthesiology 2466812128 Reassigns benefits to 1 organization
I20250326003508 OR Practitioner - Anesthesiology 2466812128 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Anesthesiology
Education
Other, 2014
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
University of MiamiGroup PAC ID 3274795109, 2,346 clinicians
University Anesthesiology Associates LLCGroup PAC ID 6901702869, 239 clinicians

Practice addresses (Care Compare)

1611 NW 12 Ave
Miami, FL 33136-1005
Phone (305) 243-3100

3181 SW Sam Jackson Park Rd
Portland, OR 97239-3011
Phone (503) 494-7641

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
87.93 of 100Reported as group
Quality
78.79
Promoting interoperability
100
Improvement activities
40
Cost
71.44

Merit-based Incentive Payment System (MIPS)

Final score
90.94 of 100Reported as apm
Quality
69.71
Promoting interoperability
100
Improvement activities
40

Merit-based Incentive Payment System (MIPS)

Final score
90.77 of 100Reported as group
Quality
84.13
Promoting interoperability
100
Improvement activities
40
Cost
73.88

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
ME165997FLMDAnesthesiology Physician
MD224333ORMDAnesthesiology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
University Professional Services Current Accepting new patients
Charleston Area Medical Center Inc CurrentSince Nov 1, 2024 Accepting new patients
Regents of the University of California CurrentSince Aug 1, 2023 Accepting new patients
University Anesthesiology Associates, LLC Anesthesiology CurrentSince May 1, 2025 Accepting new patients
University of Miami Anesthesiology CurrentSince Jan 1, 2024 Accepting new patients
University Professional Services CurrentSince May 1, 2025 Accepting new patients
University of Miami Current Accepting new patients
University Professional Services CurrentSince May 1, 2025 Accepting new patients
University of Miami CurrentSince Jan 1, 2024 Accepting new patients
Charleston Area Medical Center, Inc. CurrentSince Nov 1, 2024 Accepting new patients
Regents of the University of California Anesthesiology CurrentSince Aug 1, 2023 Accepting new patients

Locations

200 W Arbor Dr
San Diego, CA 92103
Phone (619) 543-5754

4800 NE 20th Ter
Ste 201
Ft Lauderdale, FL 33308
Phone (305) 892-4000

1611 NW 12th Ave
Miami, FL 33136
Phone (305) 585-6226

1801 NW 9th Ave
Fl 6
Miami, FL 33136
Phone (305) 355-5006

1611 NW 12th Ave
#C300
Miami, FL 33136
Phone (305) 585-7037

15700 SW Greystone Ct
Beaverton, OR 97006
Phone (503) 203-1000

3181 SW Sam Jackson Park Rd
Portland, OR 97239
Phone (503) 494-5674

400 Association Dr
Ste 102
Charleston, WV 25311
Phone (304) 388-1762

501 Morris St
Charleston, WV 25301
Phone (304) 348-6293

3200 Maccorkle Ave SE
Charleston, WV 25304
Phone (304) 388-2550

Networks

  • Freedom Health HMO Network
  • Optimum HealthCare HMO Network

Interoperability endpoints

  • Direct secure messaging: svandergreeff194603@direct.ohsu.edu

Organizations & group practices 11

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 24

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

View all 24

NPI Registry JSON

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

{
    "created_epoch": "1553040000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1775001600000",
    "number": "1285194068",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1611 NW 12TH AVE # C300",
            "city": "MIAMI",
            "state": "FL",
            "postal_code": "331361005"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1611 NW 12TH AVE # C300",
            "city": "MIAMI",
            "state": "FL",
            "postal_code": "331361005",
            "telephone_number": "303-585-1111"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "3181 SW Sam Jackson Park Rd",
            "address_purpose": "LOCATION",
            "city": "Portland",
            "state": "OR",
            "postal_code": "972393011",
            "country_code": "US",
            "telephone_number": "503-494-7641",
            "fax_number": "503-494-4661",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "UNDERWOOD",
        "first_name": "SASHA",
        "middle_name": "ALEXANDRA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2019-03-20",
        "last_updated": "2026-04-01",
        "certification_date": "2026-04-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "OR",
            "license": "MD224333",
            "primary": false
        },
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "FL",
            "license": "ME165997",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "FLORIDA DEPARTMENT OF HEALTH LICENSE NUMBER",
            "identifier": "TRN29121",
            "state": "FL"
        }
    ],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "STUART",
            "last_name": "VAN DER GREEFF",
            "middle_name": "JAMES HUIZENGA",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

Other providers in Miami, FL

Sources for this page

Verify at the official NPI Registry.