What is John Riordan's specialty?

John Riordan (NPI 1619040227) is a Medicare-billing provider whose primary specialty is Nephrology in San Francisco, CA.

Where does John Riordan practice?

John Riordan practices in San Francisco, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1619040227.

How much does Medicare pay John Riordan?

John Riordan (NPI 1619040227) received approximately $224K in total Medicare Part B payments, serving 432 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1619040227

John RiordanMD

NephrologySan Francisco, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

632

Unique beneficiaries

—

Total services

1,433

Distinct HCPCS

Medicare payment

$209K

Peer benchmark

Total Medicare services vs. 985 Nephrology providers in CA — above median (cohort median 1,482).

PRESCRIBING · PART D · 2024

Total Rx claims

1,223

Beneficiaries

—

Total drug cost

$362K

Distinct drugs

Brand share

24.2%

Top prescribed drugs

Amlodipine Besylate148 claims

Losartan Potassium133 claims

Lisinopril76 claims

Dapagliflozin Propanediol75 claims

Empagliflozin71 claims

QUALITY · MIPS · 2024

Final MIPS score

96.3

Quality

80.8

Cost

73.6

Improvement activities

40.0

Promoting interop.

100.0

Payment adjustment

0.90%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

No data available for this provider in 2024.

REFERRAL NETWORK

Where John Riordan'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). 41 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Joshua Bernstein Nephrology · San Francisco, CA	63	261
CARPENTER, HOWARD	55	169
STEVENS, SUSAN	54	169
Ilyas Iliya Internal Medicine · San Francisco, CA	54	179
City & County Of San Francisco Ambulance Service Provider · San Francisco, CA	48	103
Derk Purcell Diagnostic Radiology · San Francisco, CA	46	98
Myron Marx Diagnostic Radiology · San Francisco, CA	37	128
NPI 1275567943	36	121
TOTAL RENAL CARE INC	34	567
Edward Baker Diagnostic Radiology · San Francisco, CA	32	74
Brian Bronzo Diagnostic Radiology · San Francisco, CA	31	101
Daniel Nathanson Vascular Surgery · San Francisco, CA	28	82

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

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