Why are Medicare and Medicaid shown separately instead of combined?

They come from two different CMS data sources with no shared claim identifier, so they can't be reconciled into one number without double-counting or guessing. Every table and chart on this page keeps them fully separate.

Why is there no private/commercial revenue figure?

Private and commercial payer data comes from Transparency in Coverage files, which only publish negotiated rates — not claims or utilization volume. Without a volume figure, no revenue number can be computed for any provider from that data.

What does "Rank" mean in the Competitive Analysis & Benchmarks tables?

For a given CPT/HCPCS code, it's this provider's position by claims volume among all providers billing that same code at that geography level (State, National, or Guam for Medicaid) — rank 1 means the highest claims volume for that code.

Why is the Medicaid comparison limited to Guam only?

Medicaid is administered per-state with no single national fee schedule, so a state or national comparison the way Medicare has one isn't available. Guam (this provider's own state) is the only grouping that's conceptually meaningful.

Why are the numbers rounded to the nearest 10?

To avoid implying more precision than the underlying data supports at a single-provider level. Ratios are kept precise since they're a relative comparison, not a volume or dollar figure.

How current is this data?

The Medicare and Medicaid tables are both single current snapshots, not refreshed on a recurring schedule yet.

Nathaniel Berg (NPI 1265646806)

Key Findings

Field	Value
Entity Type	Individual
Organization	Nathaniel Berg
Address	633 Governor Carlos Camacho Road
City	Tamuning
State	GU
ZIP	96913
Taxonomy	Vascular & Interventional Radiology Physician
NPI Enumerated	May 10, 2007

Payer Source	Total Paid
Medicare	$513.1K
Medicaid	$0

This provider’s Medicare activity dominates its payer mix: total Medicare revenue is $513.1K while there is no Medicaid billing on file, so the practice is effectively single‑payer (Medicare) in the claims dataset. The top 3 Medicare codes account for 45.3% of that Medicare revenue, indicating a high concentration of earnings in a few procedure types.

The code mix is consistent with a vascular and interventional radiology practice that also provides high-volume diagnostic and screening imaging. Leading codes include 93306 (transthoracic echocardiography), 93990 (duplex ultrasound surveillance of hemodialysis grafts), and 32408 (CT/US‑guided core lung biopsy), which together drive the practice’s core service lines of vascular access surveillance, cardiopulmonary imaging, and image‑guided biopsies. This blend suggests operational focus on imaging‑guided vascular procedures and diagnostic interventions rather than broad office‑based primary care.

Revenue concentration is pronounced: 93306 generates $113.7K (25.9% of Medicare revenue), 93990 generates $45.8K (10.4%), and 32408 generates $39.6K (9.0%), with the three codes together representing 45.3% of total Medicare revenue. Reliance on these few codes implies that changes in utilization or reimbursement for these procedures would materially affect overall revenue.

Competitive standing by code shows exceptional national volume in several niche services. The provider ranks #176 of 24624 (99th percentile; extreme outlier) on 93306, #7 of 1490 (100th percentile; extreme outlier) on 93990, and #21 of 1516 (99th percentile; extreme outlier) on 32408, indicating this clinician is a major national outlier for these procedures and likely a high‑throughput source of these specific services.

Beyond the top three, the provider also reports notably above‑typical or high volumes of screening and low‑reimbursement throughput services that broaden the practice footprint. For example, 77080 (DXA) appears with 756 claims and $31.8K (7.2% of Medicare revenue) and ranks #524 of 17308 (97th percentile; notably above typical national volume), while 93005 shows 1.3K claims and $6.7K (1.5%) and ranks #11 of 6885 (100th percentile; extreme outlier), suggesting capacity to handle high volumes of screening/monitoring tests in addition to interventional work.

The wider array of billed codes — including 93454 (angiography imaging supervision), 77049 (breast MRI), 93925 (bilateral lower extremity arterial duplex), 75635 (CTA of abdominal aorta/iliofemoral arteries), and 36901 (dialysis circuit imaging) — demonstrates technical breadth across cardiovascular, breast, abdominal vascular, and dialysis access imaging. This mix supports a clinical capability set that spans noninvasive vascular diagnostics, cross-sectional vascular imaging, interventional guidance, and image‑guided biopsy services typical of interventional radiology practice models.

The provider has long tenure in the Medicare program, with NPI enumerated 2007-05-10 (~19 years ago), which combined with multiple extreme‑percentile ranks suggests established referral relationships and stable operational capacity for the high‑volume procedures observed. Longitudinal presence may help sustain specialized service lines such as dialysis graft surveillance and image‑guided biopsy.

From a risk/opportunity perspective, the practice’s heavy Medicare concentration and revenue dependence on a few high‑yield codes create both leverage and vulnerability. Being a national outlier on codes like 93306, 93990, and 32408 positions the provider as a significant performer in those niches and could be a competitive strength, but the absence of Medicaid billing and the concentration of 45.3% of Medicare revenue in three codes also make the revenue base sensitive to changes in utilization, policy, or reimbursement for those services.

Medicare: Complete Services Breakdown

The CPT/HCPCS codes generating the most Medicare revenue for this provider.

69 rows

CPT/HCPCS Code	Description	Claims	Avg Paid	Revenue
93306	The provider uses transducers to obtain two–dimensional (2D) images of the heart structures through the chest wall. He evaluates the anatomy and function of all four heart chambers, valves, adjacent…	1,210	$90	$113.7K
93990	The provider assesses the flow of blood through a hemodialysis graft using duplex ultrasound scanning. He performs this procedure to evaluate the condition of the graft.	420	$110	$45.8K
32408	In this procedure, the provider removes a core tissue sample from a lung or the mediastinum to diagnose conditions such as lung or mediastinal cancer. The code includes imaging guidance, when…	50	$750	$39.6K
93925	The provider performs a duplex ultrasound scan of the lower extremity arteries or bypass grafts on both sides. Providers perform noninvasive arterial diagnostic procedures to examine the rate of…	160	$200	$32.6K
77080	The provider performs an imaging procedure, called dual–energy X–ray absorptiometry (DXA), of one or more bony areas on the trunk to determine the bone mineral density (BMD) and whether the patient…	760	$40	$31.8K
93454	In this procedure, the provider performs imaging supervision and interpretation for a coronary angiography in which injections are performed to assess any coronary artery disease or any stenosis…	40	$590	$21.3K
77049	The provider obtains images of both breasts by applying an external magnetic field and radiofrequency waves to create three–dimensional images, with and without contrast; he may also perform…	70	$290	$19.1K
99214	The provider sees an established patient for an office visit or other outpatient visit involving evaluation and management. The visit involves a moderate level of medical decision making, and/or the…	140	$90	$12.5K
62323	The provider injects a diagnostic or a therapeutic substance, such as pain medication or a steroid, into the space around the spinal nerves of the lumbar (lower back) or sacral (caudal, or tailbone)…	60	$210	$11.7K
93970	The provider performs an ultrasound scanning procedure called a duplex scan to characterize the pattern and direction of blood flow in extremity veins (arms or legs). This is a complete, bilateral…	90	$140	$11.6K

Showing 1–10 of 69

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
Thomas Lee	GU	Dentist	$0	$10.9M
Guam Memorial Hospital	GU	General Acute Care Hospital	$0	$3.5M
Rsa - Tumon, LLC	GU	End-Stage Renal Disease (ESRD) Treatment Clinic/Center	$0	$2.9M
Robert Yang	GU	Dentist	$0	$2.4M
Antonio Garcia	GU	Pediatrics Physician	$0	$2.2M
Ma Gladys Linsangan	GU	Pediatrics Physician	$0	$2.2M
Ari Katerelos	GU	Radiation Oncology Physician	$2.1M	$0
Guam X-ray	GU	Vascular & Interventional Radiology Physician	$0	$2.1M
Sarah Clegg	GU	General Practice Dentistry	$0	$1.7M
Peter Kh Go	GU	Surgery Physician	$152.8K	$1.5M

Nathaniel Berg — Billing Profile & Reimbursement Data

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Key Findings

Medicare: Total Revenue Breakdown by CPT/HCPCS Code

Medicare: Complete Services Breakdown

Medicare: Competitive Analysis & Benchmarks

Nearby Providers

Frequently Asked Questions

References

CPT/HCPCS Code	Rank	Provider Count	Median Claims	Avg Paid	Average Revenue
32408	1	10	50	$750	$39.6K
93306	2	10	110	$70	$37.8K
74178	4	10	110	$280	$27.8K
93990	1	10	260	$110	$27.3K
99214	47	90	140	$90	$25.7K
77080	1	10	650	$40	$20.4K
71271	3	10	120	$150	$20.1K
93925	1	10	130	$170	$19.2K
77049	1	10	70	$290	$19.1K
75635	3	10	50	$240	$16.9K