What is Nathan Carlson's NPI number?

Nathan Carlson's National Provider Identifier (NPI) is 1639389653, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Nathan Carlson's specialty?

Nathan Carlson is listed in the NPPES registry with a primary specialty of Trauma Surgery Physician (Allopathic & Osteopathic Physicians).

Where is Nathan Carlson located?

Nathan Carlson's practice location on file with NPPES is 9200 W Wisconsin Ave, Milwaukee, WI 53226-3522.

What is Nathan Carlson's phone number?

The practice phone number listed in the NPPES registry for Nathan Carlson is (414) 805-8623.

Does Nathan Carlson accept Medicare?

Nathan Carlson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Nathan Carlson's NPI active?

Yes — Nathan Carlson's NPI (1639389653) is active in the NPPES registry as of the last update on 2026-03-09.

IndividualActiveAccepts Medicare

Nathan Carlson, MD

NPI 1639389653 · Trauma Surgery Physician · Milwaukee, WI

Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Nathan Carlson, MD is a Trauma Surgery Physician provider in Milwaukee, WI (NPI 1639389653).

Provider details

NPI number: 1639389653
Entity type: Individual
Primary specialty: Trauma Surgery PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: No
License: 63765 (GA)

Specialties & taxonomies

Trauma Surgery PhysicianPrimary2086S0127XLicense 71945 (WI)
Allopathic & Osteopathic Physicians
Surgical Critical Care Physician2086S0102XLicense 63765 (GA)
Allopathic & Osteopathic Physicians
Surgical Critical Care Physician2086S0102XLicense 71945 (WI)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(78/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure25% of score
19 yrs in NPPES registry
Profile completeness25% of score
100% of core fields populated
Practice footprint15% of score
5 documented practice locations
Medicare service volume (vs. specialty peers)25% of score
71 Medicare services, 2024 (ranked within specialty)
Open Payments transparency10% of score
Has Open Payments disclosures (2024)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232	36	$73
Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222	18	$121
Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223	17	$161

Typical Medicare-allowed amounts for these services range $73–$161 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$739 across 5 records (Open Payments 2024)

Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.

Practice location

9200 W Wisconsin Ave

Trauma Surgery

Milwaukee, WI 53226-3522

Phone: (414) 805-8623

Fax: (414) 805-8641

Street-level locationGet directions

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Mailing address