Skip Navigation

Central Distributor SID: Description of Data Elements
This section describes how HCUP data elements are coded, restrictions on their use, their uniform values, and State-specific coding practices.
 
MDNUM4_R - Physician 4 number (re-identified)
 
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes
 

MDNUM4_R is an arbitrarily chosen re-identified identifier for physicians created during HCUP data processing. If the original physician identifier is based on a state license number or Universal Physician Identification Number (UPIN), then MDNUM4_R can be used to track a physician across hospitals. If the original physician identifier is based on hospital-specific identifiers, then it can only be used to track physicians within a hospital. Except in those data sources where physician license numbers are supplied, it is not known whether the physician identifier refers to individual physicians or to groups. MDNUM4_R cannot be linked to any external database in order to obtain additional physician characteristic information.Refer to state-specific notes for more information about the type of physician identifiers provided by each state.

Because of a change in the algorithm for creating a masked physician number, physicians cannot be tracked from before 2003 to after 2003. In HCUP data prior to 2003, a synthetic physician number (MDNUM4_S), created using fixed-key encryption, was available. Starting in data year 2003, a reidentification number (MDNUM4_R) was used.

 
Top
 
 
 
Uniform Values
 
VariableDescriptionValueValue Description
MDNUM4_RPhysician 4 number (re-identified)9(n)Physician identifier
.Missing
 
Top
 
 
 
State Specific Notes

Arkansas

In Arkansas data, four types of physician identifiers are available:

  1. Attending physician is provided in MDNUM1_R
  2. Operating physician is provided in MDNUM2_R
  3. 1st other physician is provided in MDNUM3_R
  4. 2nd other physician is provided in MDNUM4_R.

Physician identification numbers may not accurately track physicians within and across hospitals. Arkansas provides Universal Physician Identification Numbers (UPINs) and state license numbers. The provided physician identifiers are encrypted during HCUP processing. Beginning in 2008, Arkansas also provides National Provider Identifier.



District of Columbia

In District of Columbia, four types of physician identifiers are available:

  1. Attending physician is provided in MDNUM1
  2. Other physician in MDNUM2
  3. Second other physician in MDNUM3, and
  4. Third other physician in MDNUM4.

District of Columbia provides a combination of National Provider Identifier (NPI) and Universal Physician Identification Number (UPIN).



Georgia

In Georgia four types of physician identifiers are available beginning 2008:

  1. Attending physician is provided in MDNUM1_S,
  2. 1st other physician is provided in MDNUM2_S and
  3. 2nd other physician is provided in MDNUM3_S
  4. 3rd other physician is provided in MDNUM4_S.

Physician identification numbers may not accurately track physicians within and across hospitals. Prior to 2008, either the physician's state license number or the Universal Physician Identification Number (UPIN) were used to identify the physician. Beginning 2008, the national provider identification numbers (NPI) is provided. The provided physician identifiers are encrypted during HCUP processing.



Kentucky

Beginning in 2017, Kentucky replaced the two consulting practitioner NPI numbers by the referring practitioner NPI (HCUP MDNUM3) and the patient's family practitioner NPI (HCUP MDNUM4).

Beginning in 2012, Kentucky supplies two additional consulting practitioner NPI numbers that are saved as HCUP data element MDNUM3 and MDNUM4.

Beginning October 2009, only NPIs accepted as valid IDs for both facilities and clinicians.

  1. Attending physician is provided in MDNUM1_R and
  2. Physician that performed the primary procedure is provided in MDNUM2_R.

Physician identification numbers may not accurately track physicians within and across hospitals. Kentucky collects two different types of physician identifiers, National Provider Identifier (NPI) and state license numbers.


Top
 
 
 

Internet Citation: HCUP Central Distributor SID Description of Data Elements - All States. Healthcare Cost and Utilization Project (HCUP). August 2008. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/vars/siddistnote.jsp?var=mdnum4_r.
Are you having problems viewing or printing pages on this Website?
If you have comments, suggestions, and/or questions, please contact hcup@ahrq.gov.
Privacy Notice, Viewers & Players
Last modified 8/12/08