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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.
Sister Sites: OpenMedicaid ยท OpenFeds ยท OpenSpending

ยฉ 2026 OpenMedicare. Independent data journalism. Built by TheDataProject.ai

Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. Walter Nahm
๐Ÿงด
MDIndividual

Walter Nahm, M.D., PHD.

NPI: 1467447284
San Diego, CA
10 years of data
Dermatology
$17.0M
Total Payments
343
Beneficiaries
178.0K
Services
8x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$17.0M
Specialty median$212.7K

๐Ÿ“‹ Key Findings

1Billed $17.0M over 10 years
28x markup ratio (above median)
399th percentile in Dermatology by payments
471 services/day โ€” unusually high
5Payments surged 70% in 2021
619 procedures with >3x markup

This provider averages 71 services per working day

Based on 178.0K total services over 10 years (250 working days/year). Learn about impossible service volumes โ†’

๐Ÿ”Ž Data Analysis

This provider's $17.0M in total Medicare payments ranks in the 99th percentile of Dermatology providers nationally.

Their average markup ratio of 8x is significantly above the specialty median of 2.8x.

Averaging 71 services per working day raises questions about billing patterns.

Medicare payments to this provider grew 266% 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 70% 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$471.71$101.514.65x$370.20$846.7K8.3K35
2015$464.47$106.644.36x$357.83$797.6K7.5K31
2016$495.37$114.514.33x$380.86$951.4K8.3K35
2017$507.62$116.224.37x$391.40$961.8K8.3K30
2018$407.22$87.874.63x$319.35$980.8K11.2K36
2019$578.07$107.715.37x$470.36$1.3M12.0K32
2020$680.77$104.946.49x$575.83$1.7M16.5K37
2021$817.00$67.6612.08x$749.34$3.0M43.7K38
2022$846.55$96.488.77x$750.07$3.4M35.3K33
2023$1.2K$114.9510.37x$1.1K$3.1M27.0K36

Top Procedures (20)

Q4121Theraskin, per square centimeterโš  25.5x markup
$1.8M
51.3K services$35.31/svc25.49x markup
Q4196Puraply am, per square centimeterโš  10.4x markup
$1.5M
17.9K services$85.64/svc10.45x markup
17004Destruction of precancer skin growth, 15 or more growthsโš  3.8x markup
$1.3M
10.0K services$127.75/svc3.78x markup
17111Destruction of skin growth, 15 or more growthsโš  4.6x markup
$918.5K
9.9K services$93.00/svc4.60x markup
96922Treatment of inflammatory skin disease using laser, more than 500.0 sq cmโš  3.7x markup
$880.3K
4.2K services$207.37/svc3.71x markup
17311Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocksโš  3.7x markup
$849.2K
1.5K services$564.98/svc3.67x markup
99214Established patient office or other outpatient visit, 30-39 minutesโš  3.6x markup
$706.3K
7.5K services$93.63/svc3.56x markup
88305Pathology examination of tissue using a microscope, intermediate complexityโš  6.3x markup
$618.2K
14.7K services$42.08/svc6.34x markup
Q4186Epifix, per square centimeterโš  12.5x markup
$595.3K
5.0K services$119.96/svc12.50x markup
Q4159Affinity, per square centimeter
$576.3K
1.4K services$416.74/svc2.16x markup
99213Established patient office or other outpatient visit, 20-29 minutesโš  4.0x markup
$521.0K
9.1K services$57.04/svc3.98x markup
Q4137Amnioexcel, amnioexcel plus or biodexcel, per square centimeterโš  11.3x markup
$499.9K
6.3K services$79.43/svc11.33x markup
17313Removal and microscopic exam of growth of trunk, arms, or legs, 1-5 tissue blocksโš  3.6x markup
$466.9K
876 services$533.02/svc3.56x markup
14041Repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet by transferring skin, 10.1-30.0 sq cmโš  4.6x markup
$463.5K
713 services$650.14/svc4.57x markup
17312Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocksโš  3.7x markup
$411.5K
1.2K services$338.09/svc3.69x markup
15002Preparation of skin graft site of trunk, arms, or legs, 100.0 sq cm or 1% body area for infants and children, or lessโš  3.5x markup
$404.8K
1.3K services$312.10/svc3.53x markup
15004Preparation of skin graft site of face, scalp, eyelids, mouth, neck, ears, around eyes, genitals, hands, feet, fingers, or toes, 100.0 sq cm or 1% body area for infants and children, or lessโš  3.6x markup
$399.5K
1.1K services$354.77/svc3.57x markup
11303Shaving of skin growth of body, arms, or legs, more than 2.0 cmโš  3.8x markup
$322.2K
2.9K services$110.83/svc3.76x markup
Q4180Revita, per square centimeterโš  4.9x markup
$281.4K
552 services$509.73/svc4.90x markup
Q4229Cogenex amniotic membrane, per square centimeterโš  30.5x markup
$238.9K
1.6K services$147.72/svc30.46x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
Q4121Theraskin, per square centimeter51.3K$1.8M$35.3125.49x
Q4196Puraply am, per square centimeter17.9K$1.5M$85.6410.45x
17004Destruction of precancer skin growth, 15 or more growths10.0K$1.3M$127.753.78x
17111Destruction of skin growth, 15 or more growths9.9K$918.5K$93.004.60x
96922Treatment of inflammatory skin disease using laser, more than 500.0 sq cm4.2K$880.3K$207.373.71x
17311Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks1.5K$849.2K$564.983.67x
99214Established patient office or other outpatient visit, 30-39 minutes7.5K$706.3K$93.633.56x
88305Pathology examination of tissue using a microscope, intermediate complexity14.7K$618.2K$42.086.34x
Q4186Epifix, per square centimeter5.0K$595.3K$119.9612.50x
Q4159Affinity, per square centimeter1.4K$576.3K$416.742.16x
99213Established patient office or other outpatient visit, 20-29 minutes9.1K$521.0K$57.043.98x
Q4137Amnioexcel, amnioexcel plus or biodexcel, per square centimeter6.3K$499.9K$79.4311.33x
17313Removal and microscopic exam of growth of trunk, arms, or legs, 1-5 tissue blocks876$466.9K$533.023.56x
14041Repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet by transferring skin, 10.1-30.0 sq cm713$463.5K$650.144.57x
17312Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks1.2K$411.5K$338.093.69x
15002Preparation of skin graft site of trunk, arms, or legs, 100.0 sq cm or 1% body area for infants and children, or less1.3K$404.8K$312.103.53x
15004Preparation of skin graft site of face, scalp, eyelids, mouth, neck, ears, around eyes, genitals, hands, feet, fingers, or toes, 100.0 sq cm or 1% body area for infants and children, or less1.1K$399.5K$354.773.57x
11303Shaving of skin growth of body, arms, or legs, more than 2.0 cm2.9K$322.2K$110.833.76x
Q4180Revita, per square centimeter552$281.4K$509.734.90x
Q4229Cogenex amniotic membrane, per square centimeter1.6K$238.9K$147.7230.46x

Markup Analysis

Charge-to-Payment Ratio

8x

This provider submits charges 8 times higher than what Medicare actually pays.

What This Means

A markup ratio of 8x means for every $100 Medicare pays, this provider initially charges $800. This is higher than the national average.

Location

San Diego, CA

Provider Verification

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

Similar Providers

Other Dermatology providers in CA for peer comparison.

Walter Nahm (you)
$17.0M
Artur Henke, MD
$35.6M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Artur Henke, MDRoseville, CA$35.6Mโœ“ Clear

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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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