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

Q: 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..

Q: What is Elsa Hartwick's specialty?

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

Q: 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 11 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.

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: August 16, 2026.

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

On this page

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.

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.

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

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