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DR. LEONID IZEVICH GROYSMAN MD
NPI 1104076785
Psychiatry & Neurology - Neurocritical Care in Fountain Valley, CA

Active since September 19, 2008PECOS EnrolledAccepts Medicare Assignment
100/100
CMS Quality Rating
17360 BROOKHURST ST., FOUNTAIN VALLEY, CA 92708(877) 844-0012(714) 665-4680 Get Directions Write a Review

NPPES record last updated: February 14, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 14, 2025, Sep 23, 2024, Aug 15, 2024 and 3 more (6 updates tracked since 2021).

About Dr. Leonid Izevich Groysman Md NPPES

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

DR. LEONID IZEVICH GROYSMAN MD (NPI 1104076785) is an individual neurocritical care provider in Fountain Valley, California, licensed in California (A112765) and active in the NPI registry since September 2008. He is enrolled in Medicare PECOS and is a graduate of Other (1995).

NPPES Registry Identity

NPI1104076785
Entity TypeIndividualMale
Primary Taxonomy2084A2900X
Provider Legal NameDR. LEONID IZEVICH GROYSMANCredential: MD
Location Address17360 BROOKHURST ST.Fountain Valley, CA 92708-3720
Mailing Address17360 Brookhurst St.Fountain Valley, CA 92708-3720 · (877) 844-0012 · Fax (714) 665-4680
Phone(877) 844-0012
Fax(714) 665-4680
Sole ProprietorNo
Medical School CMSOtherGraduated 1995
Enumeration DateSeptember 19, 2008
Last NPPES UpdateFebruary 14, 20256 updates tracked since enumeration
NPPES CertifiedFebruary 14, 2025
✔ NPI 1104076785 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyPsychiatry & Neurology · Neurocritical CareAllopathic & Osteopathic Physicians
Taxonomy Code2084A2900X
License✔ Licensed in CA · A112765
Definition
The medical subspecialty of Neurocritical Care is devoted to the comprehensive, multisystem care of the critically-ill neurological patient. Like other intensivists, the neurointensivist generally assumes the primary role for coordinating the care of his or her patients in the ICU, both the neurological and medical management of the patient. They may also provide consultative services for these patients as requested within the health system.
Also ListedPsychiatry & Neurology · NeurologyTaxonomy 2084N0400X · License A112765 (CA)
Also ListedPsychiatry & Neurology · PsychiatryTaxonomy 2084P0800X · License A112765 (CA)
17360 BROOKHURST ST., Fountain Valley, CA 92708
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Other Names 1

Former Name (1)Leonid Groysman Md

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Leonid Izevich Groysman Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1052443652
PECOS Enrollment IDI20100717000053
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 Leonid Groysman reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Memorialcare Medical Foundation
Same address
Clinic/Center
17360 BROOKHURST ST
Fountain Valley, CA 92708
  • Reassigned Medicare billing, California enrollment
  • 948 clinicians in this Medicare group
NPI 1205167350 (877) 696-3622
Regents Of The University Of Claifornia Univ Neursciences
6.4 mi
Neurology
101 THE CITY DR S
Orange, CA 92868
  • Reassigned Medicare billing, California enrollment
  • 135 clinicians in this Medicare group
NPI 1205884210 (714) 456-8068
Silvan Medical Consulting, Inc
15 mi
Psychiatry
2776 PACIFIC AVE
Long Beach, CA 90806
  • Reassigned Medicare billing, California enrollment
  • 4 clinicians in this Medicare group
NPI 1003599911 (949) 288-5377

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

Areas of Expertise CMS Part B claims 8

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
104 services63 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
95 services34 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
47 services46 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
31 services19 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
27 services27 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
24 services17 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality82.4
Promoting Interoperability100
Improvement Activities40

Other Providers at the Same Location NPPES 7

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

VAMSI VEMIREDDY
Internal Medicine
17360 BROOKHURST ST.
FOUNTAIN VALLEY, CA 92708
Orange County (877) 844-0012
MICHAEL DUAN MD
Internal Medicine
17360 BROOKHURST ST.
FOUNTAIN VALLEY, CA 92708
Orange County (877) 844-0012
DR. KENNETH J WILKENS MD
Orthopaedic Surgery (Orthopaedic Trauma)
17360 BROOKHURST ST.
FOUNTAIN VALLEY, CA 92708
Orange County (877) 844-0012
MS. BIANCA HEILMAN RD
Dietitian, Registered
17360 BROOKHURST ST.
FOUNTAIN VALLEY, CA 92708
Orange County (657) 241-9107
DR. ANDREW PHILIP RABENSTEIN M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery)
17360 BROOKHURST ST.
FOUNTAIN VALLEY, CA 92708
Orange County (877) 279-5289
ERIN JO
Internal Medicine
17360 BROOKHURST ST.
FOUNTAIN VALLEY, CA 92708
Orange County (877) 844-0012
MARTHA KATAURA
Dietitian, Registered
17360 BROOKHURST ST.
FOUNTAIN VALLEY, CA 92708
Orange County (657) 241-9107

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 Leonid Groysman's NPI number?

The NPI number for Leonid Groysman is 1104076785. It was assigned to this individual provider in the NPPES registry on September 19, 2008. The provider is also known as Leonid Groysman MD.

Where is Leonid Groysman located?

Leonid Groysman practices at 17360 Brookhurst St., Fountain Valley, CA 92708. The listed phone number is (877) 844-0012.

What is Leonid Groysman's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurocritical Care, with taxonomy code 2084A2900X.

Is Leonid Groysman enrolled in Medicare?

Yes. Leonid Groysman is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Leonid Groysman's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Leonid Groysman reassigns Medicare benefits to 3 organizations: Memorialcare Medical Foundation (Fountain Valley, CA), Regents Of The University Of Claifornia Univ Neursciences (Orange, CA) and Silvan Medical Consulting, Inc (Long Beach, CA). 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 Leonid Groysman'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 Leonid Groysman was last updated on February 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.