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MARK RYAN HERMANN
NPI 1851035919
Anesthesiology in Ventura, CA

Active since April 25, 2022PECOS Enrolled
147 N BRENT ST, VENTURA, CA 93003(805) 948-5011 Get Directions Write a Review

NPPES record last updated: July 6, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 6, 2026, Apr 25, 2022 (2 updates tracked since 2022).

About Mark Ryan Hermann NPPES

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

MARK RYAN HERMANN (NPI 1851035919) is an individual anesthesiology provider in Ventura, California, licensed in California (A206399) and active in the NPI registry since April 2022. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1851035919
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameMARK RYAN HERMANN
Location Address147 N BRENT STVentura, CA 93003-2854
Mailing Address147 N Brent StVentura, CA 93003-2809 · (805) 948-5011
Phone(805) 948-5011
Sole ProprietorNo
Enumeration DateApril 25, 2022
Last NPPES UpdateJuly 6, 20262 updates tracked since enumeration
NPPES CertifiedJuly 6, 2026
✔ NPI 1851035919 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in CA · A206399
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
147 N BRENT ST, Ventura, CA 93003
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark Ryan Hermann 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 Mark Hermann reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Ventura Anesthesia Medical Group
Same address
Anesthesiology
147 N BRENT ST
Ventura, CA 93003
  • Reassigned Medicare billing, California enrollment
  • 52 clinicians in this Medicare group
NPI 1164465159 (805) 652-5044

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

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.

DR. DANIEL BLAINE ASAY M.D.
Anesthesiology
147 N BRENT ST
VENTURA, CA 93003
Ventura County (801) 722-8295
CORY ROBERT GALL DO
Student in an Organized Health Care Education/Training Program
147 N BRENT ST
VENTURA, CA 93003
Ventura County (805) 948-5672
DR. ETHAN SCOTT LIEBERMAN MD
Internal Medicine
147 N BRENT ST
VENTURA, CA 93003
Ventura County (818) 719-2706
BREANNA CAYWOOD DO
Student in an Organized Health Care Education/Training Program
147 N BRENT ST
VENTURA, CA 93003
Ventura County (805) 948-5677
SHEROSE DANIELLA RENCK M.S. CCC-SLP
Speech-Language Pathologist
147 N BRENT ST
VENTURA, CA 93003
Ventura County (805) 948-5011
SERENA GERMAIN
Physical Therapist
147 N BRENT ST
VENTURA, CA 93003
Ventura County (805) 948-5011
CHUNG NAN WANG, M.D., INC.
Anesthesiology
147 N BRENT ST
VENTURA, CA 93003
Ventura County (805) 652-5011
VIGILANT MEDICAL, INC.
Anesthesiology
147 N BRENT ST
VENTURA, CA 93003
Ventura County (209) 473-6555

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 Mark Hermann's NPI number?

The NPI number for Mark Hermann is 1851035919. It was assigned to this individual provider in the NPPES registry on April 25, 2022.

Where is Mark Hermann located?

Mark Hermann practices at 147 N Brent St, Ventura, CA 93003. The listed phone number is (805) 948-5011.

What is Mark Hermann's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Mark Hermann enrolled in Medicare?

Yes. Mark Hermann is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Mark Hermann's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Hermann reassigns Medicare benefits to Ventura Anesthesia Medical Group (Ventura, 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 Mark Hermann'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 Mark Hermann was last updated on July 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.