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DR. CATHARINE MALMSTEN M.D.
NPI 1205812195
Internal Medicine - Cardiovascular Disease in Elk Grove, CA

Active since December 21, 2005PECOS Enrolled
9394 BIG HORN BLVD, ELK GROVE, CA 95758(916) 691-8500(916) 691-8599 Get Directions Write a Review

NPPES record last updated: March 23, 2022. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Dr. Catharine Malmsten M.d. NPPES

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

DR. CATHARINE MALMSTEN M.D. (NPI 1205812195) is an individual cardiovascular disease provider in Elk Grove, California, licensed in Wisconsin (51440) and active in the NPI registry since December 2005. She is enrolled in Medicare PECOS and maintains a secondary practice location in Milwaukee.

NPPES Registry Identity

NPI1205812195
Entity TypeIndividualFemale
Primary Taxonomy207RC0000X
Provider Legal NameDR. CATHARINE MALMSTENCredential: M.D.
Location Address9394 BIG HORN BLVDElk Grove, CA 95758-7977
Mailing Address3400 Data DrRancho Cordova, CA 95670-7956
Phone(916) 691-8500
Fax(916) 691-8599
Sole ProprietorNo
Enumeration DateDecember 21, 2005
Last NPPES UpdateMarch 23, 2022
NPPES CertifiedMarch 23, 2022
✔ NPI 1205812195 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RC0000X
License✔ Licensed in WI · 51440
Definition
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
Also ListedInternal MedicineTaxonomy 207R00000X · License A92678 (CA)
9394 BIG HORN BLVD, Elk Grove, CA 95758
Open in Google Maps ↗

Secondary Practice Location 1

Location 19200 W Wisconsin Ave, Suite #5100Milwaukee, WI 53226-3522 · Phone (414) 805-6633 · Fax (414) 805-6280

Other Identifiers 1

Medicaid1205812195WI

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Catharine Malmsten 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 Reassignments

3

Medicare enrollment records show Catharine Malmsten reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Regents Of The Univ Of Ca
9.2 mi
Clinical Child & Adolescent
2825 50TH ST
Sacramento, CA 95817
  • Reassigned Medicare billing, California enrollment
  • 2,570 clinicians in this Medicare group
NPI 1447423959 (916) 703-0315
Froedtert & the Medical College Of Wisconsin Community Physicians, Inc.
1,763 mi
Internal Medicine
W180N8000 TOWN HALL RD
Menomonee Falls, WI 53051
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,294 clinicians in this Medicare group
NPI 1568787448 (262) 255-2500
The Medical College Of Wisconsin, Inc.
1,769 mi
Internal Medicine
8701 WATERTOWN PLANK RD
Milwaukee, WI 53226
  • Reassigned Medicare billing, Wisconsin enrollment
  • 3,983 clinicians in this Medicare group
NPI 1699720086 (414) 955-7101

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 95758 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
$137.20 typical visit price
range $60.44 – $180.85
Typical copayment $34.30 (range $15.11 – $45.21)
Most-billed visit code 99204
Established Patient
$75.03 typical visit price
range $19.88 – $148.15
Typical copayment $18.75 (range $4.97 – $37.03)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

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

AZADEH TOOFANINEJAD D.O.
Internal Medicine (Cardiovascular Disease)
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 961-8500
NAVJOT KAUR DHILLON FNP
Nurse Practitioner (Family)
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 691-8500
JOAN BIANCA ROBERTS MD
Family Medicine
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 691-8500
MS. PATRICIA A WALLRICH PA-C
Physician Assistant
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 691-8524
JULIA T TIAN M.D.
Internal Medicine (Cardiovascular Disease)
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 691-8500
MRS. ANN P NGUYEN NP
Nurse Practitioner (Adult Health)
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 691-8500
LUE LAO MD
Internal Medicine (Cardiovascular Disease)
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 691-8500
MENALIN P GANAL DO
Family Medicine
9394 BIG HORN BLVD
ELK GROVE, CA 95758
Sacramento County (916) 691-8500

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 Catharine Malmsten's NPI number?

The NPI number for Catharine Malmsten is 1205812195. It was assigned to this individual provider in the NPPES registry on December 21, 2005.

Where is Catharine Malmsten located?

Catharine Malmsten practices at 9394 Big Horn Blvd, Elk Grove, CA 95758. The listed phone number is (916) 691-8500.

What is Catharine Malmsten's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is Catharine Malmsten enrolled in Medicare?

Yes. Catharine Malmsten is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Catharine Malmsten's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Catharine Malmsten reassigns Medicare benefits to 3 organizations: Regents Of The Univ Of Ca (Sacramento, CA), Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (Menomonee Falls, WI) and The Medical College Of Wisconsin, Inc. (Milwaukee, WI). Each 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 Catharine Malmsten'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 Catharine Malmsten was last updated on March 23, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.