Nathaniel Laden, M.D., M.S.
NPI 1356316889 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Thoracic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathaniel Laden, M.D., M.S. is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in Milwaukee, WI (NPI 1356316889).
Provider details
- NPI number
- 1356316889
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.S.
- Sex
- Male
- Sole proprietor
- No
- License
- 35.071969L (OH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
138 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 97 | $161 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 41 | $121 |
Typical Medicare-allowed amounts for these services range $121–$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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-20
- Last updated
- 2016-05-02
Frequently asked questions
- What is Nathaniel Laden's NPI number?
- Nathaniel Laden's National Provider Identifier (NPI) is 1356316889, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathaniel Laden's specialty?
- Nathaniel Laden is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Nathaniel Laden located?
- Nathaniel Laden's practice location on file with NPPES is 9200 W Wisconsin Ave, Milwaukee, WI 53226-3522.
- What is Nathaniel Laden's phone number?
- The practice phone number listed in the NPPES registry for Nathaniel Laden is (414) 955-6900.
- Does Nathaniel Laden accept Medicare?
- Nathaniel Laden is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathaniel Laden's NPI active?
- Yes — Nathaniel Laden's NPI (1356316889) is active in the NPPES registry as of the last update on 2016-05-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.