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Data Sources: Centers for Medicare & Medicaid Services (CMS), Medicare Provider Utilization and Payment Data
Disclaimer: This site is an independent journalism project. Data analysis and editorial content are not affiliated with or endorsed by CMS or any government agency. All spending figures are based on publicly available Medicare payment records.
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ยฉ 2026 OpenMedicare. Independent data journalism. Built by TheDataProject.ai

Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. Guam Surgicenter, Llc
๐Ÿ”ช
Organization

Guam Surgicenter, Llc

NPI: 1255338000
Tamuning, GU
10 years of data
Ambulatory Surgical Center
$5.6M
Total Payments
6.1K
Beneficiaries
7.9K
Services
5.68x
Markup Ratio

Peer Comparison

94th
percentile in specialty
This provider$5.6M
Specialty median$657.1K

๐Ÿ“‹ Key Findings

1Billed $5.6M over 10 years
25.68x markup ratio (above median)
394th percentile in Ambulatory Surgical Center by payments
4Payments surged 63% in 2021
518 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $5.6M in total Medicare payments ranks in the 94th percentile of Ambulatory Surgical Center providers nationally.

Their average markup ratio of 5.68x is significantly above the specialty median of 6.1x.

Medicare payments to this provider grew 75% from 2014 to 2023.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

๐Ÿ“ˆ

Notable: Payments increased 63% in 2021

Year-over-year payment surges can indicate changes in practice volume, new services, or billing pattern shifts.

Submitted Charges vs. Medicare Payments

Average per-service amounts submitted by the provider compared to what Medicare actually paid โ€” the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2014$3.5K$683.825.13x$2.8K$401.3K598490
2015$3.3K$627.005.30x$2.7K$502.9K739590
2016$3.8K$726.135.24x$3.1K$554.3K777597
2017$3.3K$592.765.64x$2.8K$474.5K724563
2018$3.5K$608.225.76x$2.9K$588.8K885663
2019$3.4K$573.885.92x$2.8K$583.5K906675
2020$3.5K$754.244.68x$2.8K$410.7K571441
2021$3.7K$839.044.44x$2.9K$671.2K903695
2022$3.7K$853.134.34x$2.8K$706.5K910670
2023$4.7K$877.675.36x$3.8K$702.8K867667

Top Procedures (20)

66984Removal of cataract with insertion of lensโš  5.8x markup
$3.1M
4.0K services$759.79/svc5.78x markup
66982Removal of cataract with insertion of lensโš  5.8x markup
$1.1M
1.4K services$753.77/svc5.80x markup
67113Repair of detached retina and drainage of eye fluid between lens and retinaโš  3.9x markup
$274.9K
207 services$1.3K/svc3.89x markup
67042Removal of membrane from the retina, pars plana approachโš  3.9x markup
$201.2K
148 services$1.4K/svc3.89x markup
43239Biopsy of the esophagus, stomach, and/or upper small bowel using an endoscopeโš  10.3x markup
$121.7K
539 services$225.83/svc10.34x markup
45380Biopsy of large bowel using an endoscopeโš  6.7x markup
$110.5K
319 services$346.41/svc6.69x markup
G0121Colorectal cancer screening; colonoscopy on individual not meeting criteria for high riskโš  7.1x markup
$94.5K
301 services$313.98/svc7.09x markup
66988Removal of cataract with insertion of lens and laser treatment to decrease fluid production in eyeโš  3.2x markup
$93.3K
55 services$1.7K/svc3.20x markup
15823Removal of excessive skin and fat of upper eyelidโš  6.0x markup
$74.0K
156 services$474.35/svc5.97x markup
66180Creation of shunt to improve eye fluid flow with graftโš  3.6x markup
$64.9K
40 services$1.6K/svc3.56x markup
67040Laser destruction of eye fluid (vitreous) between the lens and retinaโš  4.1x markup
$56.7K
43 services$1.3K/svc4.11x markup
66711Destruction of tissue encircling lens using en endoscopeโš  7.7x markup
$56.1K
146 services$384.10/svc7.74x markup
66174Dilation to improve eye fluid flowโš  4.7x markup
$49.0K
40 services$1.2K/svc4.65x markup
66183Insertion of eye fluid drainage device
$43.6K
22 services$2.0K/svc2.83x markup
29848Release of wrist ligament using an endoscopeโš  7.8x markup
$40.4K
81 services$498.43/svc7.81x markup
45385Removal of polyps or growths of large bowel using an endoscopeโš  6.6x markup
$40.0K
112 services$357.32/svc6.60x markup
66987Complex removal of cataract with insertion of lens and laser treatment to decrease fluid production in eye
$37.0K
20 services$1.8K/svc2.70x markup
29827Repair of shoulder rotator cuff using an endoscopeโš  5.2x markup
$19.1K
11 services$1.7K/svc5.23x markup
65426Removal or relocation of corneal conjunctiva, with graftโš  6.7x markup
$18.1K
29 services$625.04/svc6.71x markup
G0105Colorectal cancer screening; colonoscopy on individual at high riskโš  6.3x markup
$18.0K
51 services$353.20/svc6.30x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
66984Removal of cataract with insertion of lens4.0K$3.1M$759.795.78x
66982Removal of cataract with insertion of lens1.4K$1.1M$753.775.80x
67113Repair of detached retina and drainage of eye fluid between lens and retina207$274.9K$1.3K3.89x
67042Removal of membrane from the retina, pars plana approach148$201.2K$1.4K3.89x
43239Biopsy of the esophagus, stomach, and/or upper small bowel using an endoscope539$121.7K$225.8310.34x
45380Biopsy of large bowel using an endoscope319$110.5K$346.416.69x
G0121Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk301$94.5K$313.987.09x
66988Removal of cataract with insertion of lens and laser treatment to decrease fluid production in eye55$93.3K$1.7K3.20x
15823Removal of excessive skin and fat of upper eyelid156$74.0K$474.355.97x
66180Creation of shunt to improve eye fluid flow with graft40$64.9K$1.6K3.56x
67040Laser destruction of eye fluid (vitreous) between the lens and retina43$56.7K$1.3K4.11x
66711Destruction of tissue encircling lens using en endoscope146$56.1K$384.107.74x
66174Dilation to improve eye fluid flow40$49.0K$1.2K4.65x
66183Insertion of eye fluid drainage device22$43.6K$2.0K2.83x
29848Release of wrist ligament using an endoscope81$40.4K$498.437.81x
45385Removal of polyps or growths of large bowel using an endoscope112$40.0K$357.326.60x
66987Complex removal of cataract with insertion of lens and laser treatment to decrease fluid production in eye20$37.0K$1.8K2.70x
29827Repair of shoulder rotator cuff using an endoscope11$19.1K$1.7K5.23x
65426Removal or relocation of corneal conjunctiva, with graft29$18.1K$625.046.71x
G0105Colorectal cancer screening; colonoscopy on individual at high risk51$18.0K$353.206.30x

Markup Analysis

Charge-to-Payment Ratio

5.68x

This provider submits charges 5.68 times higher than what Medicare actually pays.

What This Means

A markup ratio of 5.68x means for every $100 Medicare pays, this provider initially charges $568. This is higher than the national average.

Location

Tamuning, GU

Provider Verification

Always verify provider credentials and location before scheduling appointments. This data reflects Medicare payments and may not include all practice locations.

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Data Sources

  • โ€ข Centers for Medicare & Medicaid Services (CMS)
  • โ€ข Medicare Provider Utilization and Payment Data (2014-2023)
  • โ€ข National Plan and Provider Enumeration System (NPPES)

Last Updated: February 2026 (data through 2023, the latest CMS release)

Note: All data is from publicly available Medicare records. OpenMedicare is an independent journalism project not affiliated with CMS.

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