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MS. ELSA MARIA HARTWICK M.D.
NPI 1558375022
Internal Medicine in Los Angeles, CA

Active since July 28, 2006PECOS Enrolled
1414 S GRAND AVE STE 380, LOS ANGELES, CA 90015(213) 222-1300(213) 222-1333 Get Directions Write a Review

NPPES record last updated: September 12, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 12, 2025, Dec 8, 2023, Jul 21, 2022 and 5 more (8 updates tracked since 2017).

About Ms. Elsa Maria Hartwick M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MS. ELSA MARIA HARTWICK M.D. (NPI 1558375022) is an individual internal medicine provider in Los Angeles, California, licensed in California (A065743) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1558375022
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameMS. ELSA MARIA HARTWICKCredential: M.D.
Location Address1414 S GRAND AVE STE 380Los Angeles, CA 90015-3072
Mailing Address2550 W Main St, Suite 301Alhambra, CA 91801-1694 · (626) 457-6900 · Fax (213) 743-9001
Phone(213) 222-1300
Fax(213) 222-1333
Sole ProprietorNo
Enumeration DateJuly 28, 2006
Last NPPES UpdateSeptember 12, 20258 updates tracked since enumeration
NPPES CertifiedDecember 8, 2023
✔ NPI 1558375022 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A065743
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedInternal Medicine · NephrologyTaxonomy 207RN0300X · License A65743 (CA)
1414 S GRAND AVE STE 380, Los Angeles, CA 90015
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Other Names 1

Former Name (1)Miss Elsa Maria Aguiniga M.d.

Secondary Practice Locations 2

Location 11414 S Grand Ave, Suite 456Los Angeles, CA 90015-3067 · Phone (213) 745-6047 · Fax (213) 748-9715
Location 21414 S Grand Ave Ste 200Los Angeles, CA 90015-3072 · Phone (213) 743-9000 · Fax (213) 743-9001

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ms. Elsa Maria Hartwick M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Elsa Hartwick reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Northeast Community Clinic
Same address
Federally Qualified Health Center (FQHC)
1414 S GRAND AVE STE 456
Los Angeles, CA 90015
  • Reassigned Medicare billing, California enrollment
  • 45 clinicians in this Medicare group
NPI 1063927564 (213) 745-6047

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90015 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 4

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
11 suppliers41 claims89 services$5.86 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
7 suppliers21 claims34 services$0.92 avg. paid by Medicare
Standard wheelchair K0001
DME-Wheelchairs · category DD000N
1 supplier11 claims11 services$7.05 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
1 supplier13 claims13 services$210.30 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 11

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NATALIE CHANEL HOUSER PA-C
Physician Assistant
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (213) 743-9000
MARTHA MATEO LCSW
Social Worker (Clinical)
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (213) 743-9000
DR. KAMI ADIBI M.D.
Family Medicine
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (310) 717-5777
ELIZABETH LOPEZ ESCOBAR
Physician Assistant
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (213) 222-1300
NOLASCO CRISTOBAL M.D
Pediatrics
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (213) 743-9000
ELIZABETH SOOBIN LEE
Physician Assistant
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (213) 745-6047
DR. RENE JOUVANNI TRABANINO M.D.
Family Medicine
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (213) 222-1300
DR. GAILA MAUREEN KENNEALLY DO
Family Medicine
1414 S GRAND AVE STE 380
LOS ANGELES, CA 90015
Los Angeles County (213) 743-9000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Elsa Hartwick's NPI number?

The NPI number for Elsa Hartwick is 1558375022. It was assigned to this individual provider in the NPPES registry on July 28, 2006. The provider is also known as Miss Elsa Maria Aguiniga M.D..

Where is Elsa Hartwick located?

Elsa Hartwick practices at 1414 S Grand Ave Ste 380, Los Angeles, CA 90015. The listed phone number is (213) 222-1300.

What is Elsa Hartwick's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Elsa Hartwick enrolled in Medicare?

Yes. Elsa Hartwick is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Elsa Hartwick's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Elsa Hartwick reassigns Medicare benefits to Northeast Community Clinic (Los Angeles, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Elsa Hartwick's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Elsa Hartwick was last updated on September 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.