KRISTI LYNN MASO M.D.
NPI 1841588936
Internal Medicine - Critical Care Medicine in Milwaukee, WI
About Kristi Lynn Maso M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KRISTI LYNN MASO M.D. (NPI 1841588936) is an individual critical care medicine provider in Milwaukee, Wisconsin, licensed in Wisconsin (65388) and active in the NPI registry since July 2011. She is enrolled in Medicare PECOS, is affiliated with Ascension Columbia St Mary's Hospital Milwaukee, and maintains a secondary practice location in Milwaukee.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Kristi Lynn Maso M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
8Medicare enrollment records show Kristi Maso reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Milwaukee, WI 53211
- Reassigned Medicare billing, Wisconsin enrollment
- 1,343 clinicians in this Medicare group
Milwaukee, WI 53215
- Reassigned Medicare billing, Wisconsin enrollment
- 22 clinicians in this Medicare group
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- 3,983 clinicians in this Medicare group
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Emergency Medicine Specialists Sc
- 244 clinicians in this Medicare group
Menomonee Falls, WI 53051
- Reassigned Medicare billing, Wisconsin enrollment
- 2,294 clinicians in this Medicare group
Mount Pleasant, WI 53405
- Reassigned Medicare billing, Wisconsin enrollment
- 72 clinicians in this Medicare group
Beaver Dam, WI 53916
- Reassigned Medicare billing, Wisconsin enrollment
- 606 clinicians in this Medicare group
Stevens Point, WI 54482
- Reassigned Medicare billing, Wisconsin enrollment
- 633 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ascension Columbia St Mary's Hospital Milwaukee
Acute Care Hospitals · Milwaukee, WIAscension St Francis Hospital
Acute Care Hospitals · Milwaukee, WIAscension SE Wisconsin Hospital
Acute Care Hospitals · Milwaukee, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53233 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MILWAUKEE, WI 53233
MILWAUKEE, WI 53233
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Kristi Maso's NPI number?
The NPI number for Kristi Maso is 1841588936. It was assigned to this individual provider in the NPPES registry on July 11, 2011.
Where is Kristi Maso located?
Kristi Maso practices at 945 N 12th St, Milwaukee, WI 53233. The listed phone number is (414) 519-2000.
What is Kristi Maso's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Kristi Maso enrolled in Medicare?
Yes. Kristi Maso is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Kristi Maso's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kristi Maso reassigns Medicare benefits to 8 organizations: Ascension Medical Group-Southeast Wisconsin Inc (Milwaukee, WI), Greater Milwaukee Critical Care And Pulmonary Associates Sc (Milwaukee, WI), The Medical College Of Wisconsin, Inc. (Milwaukee, WI), Emergency Medicine Specialists, S.C. (Milwaukee, WI), Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (Menomonee Falls, WI) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Kristi Maso's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Kristi Maso accept?
Health plans from CareSource (Common Ground Healthcare) list Kristi Maso as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Kristi Maso affiliated with any hospitals?
According to CMS data, Kristi Maso is affiliated with Ascension Columbia St Mary's Hospital Milwaukee, Ascension St Francis Hospital and Ascension SE Wisconsin Hospital.
When was this NPI record last updated?
The NPPES record for Kristi Maso was last updated on March 3, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Kristi Lynn Maso, M.D. · NPI 1841588936
Critical Care Medicine physician in Milwaukee, Wisconsin. Individual provider, active in the CMS NPPES registry since July 11, 2011.
## Identity
- **NPI:** 1841588936 (Entity type: Individual)
- **Enumerated:** July 11, 2011
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 65388 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 945 N 12TH ST, Milwaukee, WI 53233-1305
- **Phone:** (414) 519-2000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Ascension Medical Group-Southeast Wisconsin Inc (NPI 1194473066, Milwaukee, WI); Greater Milwaukee Critical Care And Pulmonary Associates Sc (NPI 1952569816, Milwaukee, WI); The Medical College Of Wisconsin, Inc. (NPI 1699720086, Milwaukee, WI); Emergency Medicine Specialists, S.C. (NPI 1568413524, Milwaukee, WI); Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (NPI 1568787448, Menomonee Falls, WI); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** March 3, 2021
- **Other identifiers:** Medicaid 1841588936 (WI)
---
Source: [NPI Profile](https://npiprofile.com/npi/1841588936) · Data from the CMS NPPES public registry.