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NPI 1457558025 · Tamuning, GU · Emergency Medicine Physician
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Eric Greenfield is a emergency medicine physician provider located in Tamuning, Guam. This profile covers 4 Medicare and 4 Medicaid CPT/HCPCS procedure codes, with claims volume, average reimbursement, and total revenue by code, benchmarked against other providers billing the same services.
Provider details (source: NPPES NPI Registry)
| Field | Value |
|---|---|
| Entity Type | Individual |
| Organization | Eric Greenfield |
| Address | 850 Gov Carlos G Camacho Rd |
| City | Tamuning |
| State | GU |
| ZIP | 96913 |
| Taxonomy | Emergency Medicine Physician |
| NPI Enumerated | June 28, 2007 |
Lifetime revenue by payer source (source: CMS Medicare & Medicaid claims data)
| Payer Source | Total Paid |
|---|---|
| Medicaid | $39.4K |
| Medicare | $32.5K |
ERIC GREENFIELD is an Emergency Medicine Physician whose Medicare billing is heavily concentrated in high-acuity ED and critical-care codes: 99285, 99291, and 99284 together account for 97.1% of this provider's total Medicare revenue, against a lifetime Medicare total of $32.5K. The Medicare top earner is 99285 (149 claims, $132 avg paid/claim, $19.7K revenue), followed by 99291 (55 claims, $161 avg paid/claim, $8.9K).
On the Medicaid side the revenue profile is similarly focused on ED visit codes: 99284, 99283, and 99285 together account for 99.6% of this provider's total Medicaid revenue, with a lifetime Medicaid total of $39.4K. The single largest Medicaid line is 99284 (346 claims, $53 avg paid/claim, $18.3K revenue), indicating most Medicaid activity is concentrated in moderate-level ED visits.
Comparing payer scale, Medicaid revenue ($39.4K) slightly exceeds Medicare revenue ($32.5K), so this provider is not effectively single-payer and shows a modest tilt toward Medicaid in lifetime revenue. Both payers are active contributors to the practice’s overall billing footprint rather than one dominant source.
The mix of codes shows operational emphasis on emergency department care with substantial critical-care activity: on Medicare the presence of 99291 (55 claims) signals time-based critical care billing in addition to high-acuity ED E/M work (99285: 149 claims). Ancillary testing like 93010 (ECG) appears frequently but contributes little revenue per claim (Medicare 93010: 155 claims, $6 avg paid/claim; Medicaid 93010: 48 claims, $3 avg paid/claim), consistent with routine ECGs performed alongside ED encounters.
Revenue concentration is very high for both payers: the top three Medicare codes make up 97.1% of Medicare revenue and the top three Medicaid codes make up 99.6% of Medicaid revenue. That concentration indicates the provider’s financial performance is tightly tied to a small set of ED/critical-care service lines rather than a broad mix of codes.
National competitive standing on Medicare is modest: 99285 ranks #21984 of 61347 providers (64th percentile) and 99291 ranks #29241 of 71290 providers (58th percentile), both described in the source as "typical, unremarkable volume for this code." Lower ranking for 99284 (29th percentile) suggests less volume on moderate-level ED visits relative to national peers. Overall, the provider does not appear to be a dominant national player for these codes but is an active, typical-volume ED clinician.
State-level standing on Medicaid shows a small peer set and generally low-to-mid in-state positioning: 99284 is ranked #5 of 5 providers (0th percentile) and 99285 is also #5 of 5 (0th percentile), while 99283 is #4 of 5 (25th percentile), each labeled "typical, unremarkable volume for this code." These rankings imply the provider operates within a limited in-state market where few providers are ranked, and their Medicaid volume is not prominent versus the small set of peers.
The provider’s NPI was enumerated on 2007-06-28 (~19 years ago), indicating long tenure in the Medicare/Medicaid systems. Coupled with the concentrated code mix (top three codes driving 97.1% of Medicare and 99.6% of Medicaid revenue), this suggests a stable, focused ED practice model that consistently bills a narrow set of emergency and critical-care services.
Medicare revenue breakdown by CPT/HCPCS procedure code.
View: Bar Chart1 / 2
The CPT/HCPCS codes generating the most Medicare revenue for this provider.
4 rows
| CPT/HCPCS Code | Description | Claims | Avg Paid | Revenue |
|---|---|---|---|---|
| 99285 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a high level of medical decision making. | 150 | $130 | $19.7K |
| 99291 | Critical care services include the treatment of vital organ failure or prevention of further life–threatening conditions. Delivering medical care in a moment of crisis and in time of emergency is… | 60 | $160 | $8.9K |
| 99284 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a moderate level of medical decision making. | 40 | $90 | $3.1K |
| 93010 | The provider interprets and reports on the results of a routine 12–lead (or more) electrocardiogram. | 160 | $10 | $930 |
How this provider's Medicare billing volume and revenue compare to other providers nationally and within its state, across 4 CPT/HCPCS codes.
Medicaid revenue breakdown by year and by CPT/HCPCS procedure code, including monthly billing trends and the top codes driving revenue.
View: By Year1 / 3
Every CPT/HCPCS code this provider has billed to Medicaid, with claims volume, average payment, and total revenue.
4 rows
| CPT/HCPCS Code | Description | Claims | Avg Paid | Revenue |
|---|---|---|---|---|
| 99284 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a moderate level of medical decision making. | 350 | $50 | $18.3K |
| 99283 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a low level of medical decision making. | 360 | $40 | $12.6K |
| 99285 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a high level of medical decision making. | 130 | $70 | $8.3K |
| 93010 | The provider interprets and reports on the results of a routine 12–lead (or more) electrocardiogram. | 50 | $1 | $140 |
How this provider's Medicaid billing volume and revenue compare to other Guam providers billing the same CPT/HCPCS codes.
Full comparison — all codes billed, vs. Guam median
4 rows
| CPT/HCPCS Code | Description | Rank | Provider Count | Median Claims | Avg Paid | Average Revenue |
|---|---|---|---|---|---|---|
| 99283 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a low level of medical decision making. | 4 | 10 | 1,880 | $410 | $2M |
| 99284 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a moderate level of medical decision making. | 5 | 10 | 3,240 | $290 | $1.3M |
| 99285 | The provider sees a patient for an emergency department visit involving evaluation and management (E/M). The visit involves a high level of medical decision making. | 5 | 10 | 1,010 | $140 | $191.9K |
| 93010 | The provider interprets and reports on the results of a routine 12–lead (or more) electrocardiogram. | 5 | 10 | 2,920 | $10 | $31.5K |
Other providers in the same ZIP code as Eric Greenfield, ranked by combined Medicare and Medicaid revenue.
| 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 |
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