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PENN, ALEX NPI 1972881159 Clinician

Interventional Radiology · WALNUT CREEK, CA

Specialty Interventional Radiology — from billed Medicare claims
Trained UNIVERSITY OF CALIFORNIA, SAN FRANCISCO SCHOOL OF MEDICINE — medical school, self-reported to CMS
In practice about 15 years since medical school (class of 2011, self-reported to CMS)
Location WALNUT CREEK, CA · NPPES registered location
Active in data Billed Medicare 2020–2024 (5 consecutive years)
Scale 56 codes billed · 3,898 disclosed services (CY2024 — most recent year in data)
Current groups
member of 4 groups; the volumes below are this clinician's personal volume and are not attributed to any single group

Group affiliation since 2019

20192026
NORTHBAY PHYSICIANS SURGERY CENTER, LLC
2025–2026
COUNTY OF SANTA CLARA
2023–2026
SOLANO DIAGNOSTICS PARTNERS A CALIF LIMITED PARTNERSHIP
2021–2026
BAY IMAGING CONSULTANTS MEDICAL GROUP INC
2020–2026
COUNTY OF SANTA CLARA
2019–2020

The roster archive begins in 2019, so a span starting at 2019 may reach back further. Membership spans only — no volume is attributed to any group here.

NPPES registry · CMS Doctors & Clinicians registry · Medicare Part B physician/supplier claims · NPPES record last updated 2025-06

Year: 2024 · 2023 · 2022  · 2021  · 2020 

Provider overview · all codes · CY2024

The full analytics for this provider

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The billed-volume positioning, practice focus, and economics behind this provider — computed on the same disclosed Medicare Part B data.

This provider's disclosed Medicare payments across all codes were in CY2024. Unlock to see the figure.

  • Payment, service & beneficiary totals — the disclosed scale, all codes
  • Practice profile — focus & reach — top codes by share of services
  • Office vs. facility setting mix — place-of-service code split
  • Volume over five years — discrete yearly counts, no rate
  • Peer positioning — service volume — percentile among specialty peers, cohort & year disclosed
  • Peer positioning — code breadth — how many codes billed, vs peers

Peer positioning shows billed-volume and code-breadth positions among specialty peers, not measures of care (a provider's true volume position can only be higher, never lower). All figures disclosed Medicare Part B fee-for-service; volumes are personal to this NPI, not attributed to any group.

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Procedures billed to Medicare Part B (2024)

Medicare Part B FFS · CY2024 · as published by CMS
CodeDescription Services Beneficiary-episodes Avg charge Avg Medicare payment
71045 X-ray of chest, 1 view
70450 Ct scan head or brain without contrast
74177 Ct scan of abdomen and pelvis with contrast
71250 Ct scan of chest without contrast
99152 Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes
71046 X-ray of chest, 2 views
74176 Ct scan of abdomen and pelvis without contrast
77080 Dxa bone density measurement of hip, pelvis, spine
76770 Complete ultrasound scan behind abdominal cavity
93971 Ultrasound study of one arm or leg veins with compression and maneuvers
74230 Imaging for evaluation of swallowing function
49083 Drainage of fluid from abdominal cavity using imaging guidance
76705 Limited ultrasound scan of abdomen
70496 Ct scan of blood vessels of head with contrast
70498 Ct scan of blood vessels of neck with contrast
71275 Ct scan of blood vessels of chest with contrast
71260 Ct scan of chest with contrast
76937 Ultrasonic guidance for blood vessel access
74018 X-ray of abdomen, 1 view
93880 Ultrasound of both sides of head and neck blood flow
72125 Ct scan of upper spine without contrast
93970 Ultrasound study of arm or leg veins with compression and maneuvers
77001 Fluoroscopic guidance for insertion or removal of central vein access device
73562 X-ray of knee, 3 views
76700 Complete ultrasound scan of abdomen
32555 Aspiration of fluid from chest cavity using imaging guidance
73502 X-ray of hip, 2-3 views
72170 X-ray of pelvis, 1-2 views
73630 X-ray of foot, minimum of 3 views
76536 Ultrasound scan of head and neck soft tissue
73030 X-ray of shoulder, minimum of 2 views
36561 Insertion of central venous tube with port (5 years or older)
76942 Ultrasonic guidance for needle placement
77012 Review by radiologist of ct guidance for needle placement
73564 X-ray of knee, 4 or more views
73130 X-ray of hand, minimum of 3 views
73560 X-ray of knee, 1-2 views
78452 Nuclear medicine studies of heart muscle at rest and with stress and spect
72131 Ct scan of lower spine without contrast
36558 Insertion of tunneled central venous tube for infusion (5 years or older)
47000 Needle biopsy of liver through skin
74174 Ct scan of blood vessels of abdomen and pelvis with contrast
72100 X-ray of lower and sacral spine, 2-3 views
70486 Ct scan of face without contrast
74178 Ct scan of abdomen and pelvis before and after contrast
72192 Ct scan of pelvis without contrast
10005 Fine needle aspiration biopsy using ultrasound guidance, first growth
50432 Placement of tube of kidney using imaging guidance with review by radiologist
73552 X-ray of thigh bone, minimum 2 views
76830 Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina
72132 Ct scan of lower spine with contrast
73060 X-ray of upper arm, minimum of 2 views
73110 X-ray of wrist, minimum of 3 views
73590 X-ray of lower leg, 2 views
76775 Limited ultrasound scan behind abdominal cavity
76856 Complete ultrasound scan of pelvis

These are this provider's own Medicare Part B fee-for-service volumes (CMS public data). CMS suppresses rows with fewer than 11 beneficiaries, so low-volume codes may be missing entirely — absence is not zero. Beneficiary-episodes count CMS's per-setting beneficiary figures, not unique patients. Average charge and average Medicare payment are weighted by service volume across office and facility settings. Volumes on this page are personal to the NPI and are not attributed to any physician group. See Methods & Sources.