What is Johnna Walker's specialty?

Johnna Walker (NPI 1497919401) is a Medicare-billing provider whose primary specialty is Physician Assistant in San Francisco, CA.

Where does Johnna Walker practice?

Johnna Walker practices in San Francisco, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1497919401.

How much does Medicare pay Johnna Walker?

Johnna Walker (NPI 1497919401) received approximately $98K in total Medicare Part B payments, serving 527 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1497919401

Johnna WalkerPA-C

PRACTICEMARK A. SCHRUMPF MD A PROFESSIONAL CORPORATIONSee all providers at this practice →

Physician AssistantSan Francisco, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,215

Unique beneficiaries

—

Total services

4,468

Distinct HCPCS

Medicare payment

$94K

Peer benchmark

Total Medicare services vs. 7,073 Physician Assistant providers in CA — top quintile (cohort median 224).

PRESCRIBING · PART D · 2024

Total Rx claims

730

Beneficiaries

—

Total drug cost

$14K

Distinct drugs

Brand share

7.9%

Top prescribed drugs

Oxycodone Hcl196 claims

Celecoxib185 claims

Amoxicillin86 claims

Tramadol Hcl62 claims

Diclofenac Sodium38 claims

QUALITY · MIPS · 2024

Final MIPS score

83.8

Quality

90.5

Cost

75.6

Improvement activities

40.0

Promoting interop.

76.0

Payment adjustment

0.37%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$32

Payment records

By payment type

Food and Beverage$32

Top paying entities

Food and Beverage$32

REFERRAL NETWORK

Where Johnna Walker's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 3 inbound referrers · 4 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Peter Callander Orthopedic Surgery · San Francisco, CA	41	115
SUTTER BAY HOSPITALS	11	23
Caroline Dejean Anesthesiology · Cleveland, OH	11	11

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
SUTTER BAY HOSPITALS	40	45
Peter Callander Orthopedic Surgery · San Francisco, CA	37	76
SUTTER VISITING NURSE ASSOCIATION AND HOSPICE	17	17
Protransport 1 Ambulance Service Provider · Rohnert Park, CA	15	16

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events