HCPList Know more before you call. About
A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

Compare the published Medicare service mix of David Alan Janssen, M.D. with clinicians in the same registry specialty: Infectious Disease · Internal Medicine (CMS).

O FALLON, MO · 25 milesEdit location
Within 25 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 19 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Manokiran Patri, M.D.

Infectious Disease · Internal Medicine (CMS) · Saint Charles, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
94%Service-mix similarity~12.4 milesView profile →

Shephali Himanshu Wulff, D.O

Infectious Disease · Internal Medicine (CMS) · Saint Charles, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
82%Service-mix similarity~12.4 milesView profile →

Phillip G Zinser, MD

Specialty details in registry · Bridgeton, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
78%Service-mix similarity~17.4 milesView profile →

Guy William Chambers, M.D.

Infectious Disease (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
78%Service-mix similarity~19.4 milesView profile →

Nicolo Leyeza Cabrera, MD

Infectious Disease · Internal Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
78%Service-mix similarity~17.7 milesView profile →

Nirmol Mary Philip, M.D.

Infectious Disease (CMS) · Chesterfield, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
75%Service-mix similarity~14.4 milesView profile →

Hamzah Mohd, M.D.,

Specialty details in registry · Saint Louis, MO

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
75%Service-mix similarity~17.7 milesView profile →

David Olon Mccrary, M.D.

Infectious Disease · Internal Medicine (CMS) · Chesterfield, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
74%Service-mix similarity~14.4 milesView profile →

Lee Kien Yong, M.D.

Infectious Disease · Internal Medicine (CMS) · Saint Charles, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
73%Service-mix similarity~12.4 milesView profile →

Matthew L German, M.D.

Infectious Disease · Internal Medicine (CMS) · Chesterfield, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
72%Service-mix similarity~14.4 milesView profile →

Julie Ann Shapiro-Schere, D.O.

Infectious Disease · Internal Medicine (CMS) · Bridgeton, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
65%Service-mix similarity~17.4 milesView profile →

Adnan Siddiqui, MD

Infectious Disease · Internal Medicine (CMS) · Bridgeton, MO

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
64%Service-mix similarity~17.4 milesView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in approximate distance order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.