1997 Economic Census: 

Bridge Between NAICS and SIC 

Health care & social assistance 

 

NAICS 621: Ambulatory health care services - 

Finder by Major Group (2-digit SIC) 

Go to 

bridge NAICS Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

Taxable 440,200 310,012,321 3,744,279 137,979,315 621 Ambulatory health care 

services Exempt 15,181 45,428,453 669,335 17,884,218 

6211 Offices of physicians Taxable 195,449 171,629,179 1,571,145 84,976,577 

6212 Offices of dentists Taxable 114,178 48,482,037 641,674 18,226,762 

6213 Offices of other health 

practitioners Taxable 88,886 28,282,299 406,589 10,456,729 

Taxable 11,828 17,306,497 173,809 5,501,909 6214 Outpatient care centers Exempt 9,940 31,561,321 346,501 11,157,881 

6215 Medical & diagnostic 

laboratories Taxable 9,076 16,317,096 151,338 5,401,749 

Taxable 16,315 21,474,024 681,505 10,940,964 6216 Home health care services

Exempt 3,375 10,104,243 267,484 5,426,172 

Taxable 4,468 6,521,189 118,219 2,474,625 6219 Other ambulatory health 

care services Exempt 1,866 3,762,889 55,350 1,300,165 

 

NAICS 621: Ambulatory health care services - 6-

digit NAICS by 4-digit SIC 

Includes only establishments with payroll. Introductory text includes scope and methodology. 

Figures to the left of SIC codes indicate the percent of SIC receipts represented by that part; and 

link to Table 1 where other parts of the NAICS are shown. links to 1997 and 1992 

Comparative Statistics for whole SICs. 

NAICS SIC Pt Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

6211 Offices of physicians Taxable 195,449 171,629,179 1,571,145 84,976,577 
62111 Offices of physicians Taxable 195,449 171,629,179 1,571,145 84,976,577 

621111 Not Comparable Offices of physicians 

(except mental health 

specialists)

Taxable 185,094 168,251,883 1,536,459 83,482,128 

95% of 8011 01

Offices of doctors of 

medicine (except 

mental health 

specialists)

Taxable 176,258 163,794,407 1,484,257 81,417,962 

98% of 8031 01

Offices of doctors of 

osteopathy (exc mental 

health specialists)

Taxable 8,836 4,457,476 52,202 2,064,166 

621112 Not Comparable Offices of physicians, mental health 

specialists

Taxable 10,355 3,377,296 34,686 1,494,449 

2% of 8011 02

Offices of doctors of 

medicine (mental health 

specialists)

Taxable 10,059 3,304,584 33,716 1,462,512 

2% of 8031 02

Offices of doctors of 

osteopathy (mental 

health specialists)

Taxable 296 72,712 970 31,937 

NAICS SIC Pt Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

6212 Offices of dentists Taxable 114,178 48,482,037 641,674 18,226,762 

62121 Offices of dentists Taxable 114,178 48,482,037 641,674 18,226,762 

621210 Comparable

Offices of dentists Taxable 114,178 48,482,037 641,674 18,226,762 

8021 Offices of dentists Taxable 114,178 48,482,037 641,674 18,226,762 

NAICS SIC Pt Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

6213 Offices of other health 

practitioners Taxable 88,886 28,282,299 406,589 10,456,729 

62131 Offices of 

chiropractors Taxable 30,487 6,570,083 91,700 1,886,173 

621310 Comparable

Offices of chiropractors Taxable 30,487 6,570,083 91,700 1,886,173 

8041 Offices of chiropractors Taxable 30,487 6,570,083 91,700 1,886,173 

62132 Offices of 

optometrists Taxable 17,875 6,361,839 79,545 1,773,428 

621320 Comparable

Offices of optometrists Taxable 17,875 6,361,839 79,545 1,773,428 

8042 Offices of optometrists Taxable 17,875 6,361,839 79,545 1,773,428 

62133 Offices of mental 

health practitioners Taxable 11,750 2,504,820 38,427 947,521 
(except physicians)

621330 Not Comparable

Offices of mental health 

practitioners (except 

physicians)

Taxable 11,750 2,504,820 38,427 947,521 

19% of 8049 10

Offices of mental health 

practitioners (except 

physicians)

Taxable 11,750 2,504,820 38,427 947,521 

62134 

Offices of physical, 

occup, & speech 

therapists & 

audiologists

Taxable 14,277 8,684,039 141,533 4,376,786 

621340 Not Comparable

Offices of physical, 

occup, & speech 

therapists & 

audiologists

Taxable 14,277 8,684,039 141,533 4,376,786 

67% of 8049 

Offices of physical, 

occup, & speech 

therapists & 

audiologists

Taxable 14,277 8,684,039 131,025 4,376,786 

8049 20 Offices of physical & 

occupational therapists Taxable 11,962 7,969,557 131,025 4,105,525 

8049 30

Offices of speech 

therapists & 

audiologists 

Taxable 2,315 714,482 10,508 271,261 

62139 Offices of all other 

health practitioners Taxable 14,497 4,161,518 55,384 1,472,821 

621391 Comparable

Offices of podiatrists Taxable 8,662 2,393,443 30,472 771,151 

8043 Offices of podiatrists Taxable 8,662 2,393,443 30,472 771,151 

621399 Not Comparable

Offices of all other 

miscellaneous health 

practitioners

Taxable 5,835 1,768,075 24,912 701,670 

14% of 8049 40 Offices of all other 

health practitioners Taxable 5,835 1,768,075 24,912 701,670 

NAICS SIC Pt Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

Taxable 11,828 17,306,497 173,809 5,501,909 6214 Outpatient care 

centers Exempt 9,940 31,561,321 346,501 11,157,881 

Taxable 443 277,683 4,022 95,394 62141 Family planning 

centers Exempt 1,390 668,027 14,100 296,105 

621410 Not Comparable

Family planning centers Taxable 443 277,683 4,022 95,394 

4% of 8093 10 Family planning centers Taxable 423 276,261 3,965 94,940 

0% of 8099 10 Childbirth preparation 

classes Taxable 20 1,422 57 454 
621410 Not Comparable

Family planning centers Exempt 1,390 668,027 14,100 296,105 

4% of 8093 10 Family planning centers Exempt 1,365 659,828 13,820 291,834 

0% of 8099 10 Childbirth preparation 

classes Exempt 25 8,199 280 4,271 

Taxable 2,648 1,503,605 23,001 579,137 

62142 

Outpatient mental 

health & substance 

abuse centers Exempt 3,646 4,714,846 102,096 2,419,060 

621420 Not Comparable Outpatient mental health & substance 

abuse centers

Taxable 2,648 1,503,605 23,001 579,137 

21% of 8093 20

Outpatient mental 

health & substance 

abuse centers

Taxable 2,648 1,503,605 23,001 579,137 

621420 Not Comparable Outpatient mental 

health & substance 

abuse centers

Exempt 3,646 4,714,846 102,096 2,419,060 

26% of 8093 20

Outpatient mental 

health & substance 

abuse centers

Exempt 3,646 4,714,846 102,096 2,419,060 

Taxable 8,737 15,525,209 146,786 4,827,378 62149 Other outpatient care 

centers Exempt 4,904 26,178,448 230,305 8,442,716 

621491 Not Comparable

HMO medical centers Taxable 262 1,709,323 11,029 419,527 

1% of 8011 03 HMO medical centers Taxable 262 1,709,323 11,029 419,527 

621491 Not ComparableHMO medical centers Exempt 510 12,289,824 47,218 1,985,165 

95% of 8011 03 HMO medical centers Exempt 510 12,289,824 47,218 1,985,165 

621492 Comparable

Kidney dialysis centers Taxable 1,953 4,310,817 38,503 1,147,692 

8092 Kidney dialysis centers Taxable 1,953 4,310,817 38,503 1,147,692 

621492 ComparableKidney dialysis centers Exempt 261 583,703 6,638 193,376 

8092 Kidney dialysis centers Exempt 261 583,703 6,638 193,376 

621493 Not Comparable Freestanding 

ambulatory surgical & 

emergency centers

Taxable 2,089 4,088,108 34,295 1,262,848 

2% of 8011 04

Freestanding 

ambulatory surgical & 

emergency centers

Taxable 2,089 4,088,108 34,295 1,262,848 

621493 Not Comparable Freestanding ambulatory surgical & 

emergency centers

Exempt 313 672,979 8,121 261,599 

5% of 8011 04

Freestanding 

ambulatory surgical & 

emergency centers

Exempt 313 672,979 8,121 261,599 
621498 Not Comparable All other outpatient care 

centers Taxable 4,433 5,416,961 62,959 1,997,311 

75% of 8093 30 All other outpatient care 

centers Taxable 4,433 5,416,961 62,959 1,997,311 

621498 Not Comparable All other outpatient care 

centers Exempt 3,820 12,631,942 168,328 6,002,576 

70% of 8093 30 All other outpatient care 

centers Exempt 3,820 12,631,942 168,328 6,002,576 

NAICS SIC Pt Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

6215 Medical & diagnostic 

laboratories Taxable 9,076 16,317,096 151,338 5,401,749 

62151 Medical & diagnostic 

laboratories Taxable 9,076 16,317,096 151,338 5,401,749 

621511 Not Comparable

Medical laboratories Taxable 4,655 10,443,452 107,474 3,519,456 

64% of 8071 10 Medical laboratories Taxable 4,655 10,443,452 107,474 3,519,456 

621512 Not Comparable Diagnostic imaging 

centers Taxable 4,421 5,873,644 43,864 1,882,293 

36% of 8071 20 Diagnostic imaging 

centers Taxable 4,421 5,873,644 43,864 1,882,293 

NAICS SIC Pt Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

Taxable 16,315 21,474,024 681,505 10,940,964 6216 Home health care 

services Exempt 3,375 10,104,243 267,484 5,426,172 

Taxable 16,315 21,474,024 681,505 10,940,964 62161 Home health care 

services Exempt 3,375 10,104,243 267,484 5,426,172 

621610 Comparable Home health care 

services Taxable 16,315 21,474,024 681,505 10,940,964 

8082 Home health care 

services Taxable 16,315 21,474,024 681,505 10,940,964 

621610 Comparable Home health care 

services Exempt 3,375 10,104,243 267,484 5,426,172 

8082 Home health care 

services Exempt 3,375 10,104,243 267,484 5,426,172 

NAICS SIC Pt Description

Establishments

Receipts 

($1,000)

Paid

employees

Annual

payroll

($1,000)

Taxable 4,468 6,521,189 118,219 2,474,625 6219 Other ambulatory 

health care services Exempt 1,866 3,762,889 55,350 1,300,165 

Taxable 2,453 4,206,729 90,054 1,803,333 62191 Ambulance services

Exempt 1,032 820,674 21,172 319,570 

621910 Not Comparable

Ambulance services Taxable 2,453 4,206,729 90,054 1,803,333 
46% of 4119 30 Ambulance or rescue 

service, (except by air) Taxable 2,271 3,723,554 86,494 1,684,815 

10% of 4522 04 Air ambulance Taxable 182 483,175 3,560 118,518 

621910 Not ComparableAmbulance services Exempt 1,032 820,674 21,172 319,570 

9% of 4119 30 Ambulance or rescue 

service, (except by air) Exempt 1,004 719,620 19,860 295,341 

2% of 4522 04 Air ambulance Exempt 28 101,054 1,312 24,229 

Taxable 2,015 2,314,460 28,165 671,292 62199 All other ambulatory 

health care services Exempt 834 2,942,215 34,178 980,595 

621991 Not Comparable

Blood & organ banks Taxable 504 1,017,082 10,266 242,944 

43% of 8099 40 Blood & organ banks Taxable 504 1,017,082 10,266 242,944 

621991 Not ComparableBlood & organ banks Exempt 726 2,851,025 32,731 943,507 

97% of 8099 40 Blood & organ banks Exempt 726 2,851,025 32,731 943,507 

621999 Not Comparable

All other miscellaneous 

ambulatory health care 

services

Taxable 1,511 1,297,378 17,899 428,348 

55% of 8099 50

All other miscellaneous 

ambulatory health care 

services

Taxable 1,511 1,297,378 17,899 428,348 

621999 Not Comparable

All other miscellaneous 

ambulatory health care 

services

Exempt 108 91,190 1,447 37,088 

3% of 8099 50

All other miscellaneous 

ambulatory health care 

services

Exempt 108 91,190 1,447 37,088 

N=Not available D=Withheld to avoid disclosure 

% Comparability may be limited because of changes in assignment of tax status by industry. 

=sum of SIC parts listed below the symbol 

(Bridge complete.) Comparable NAICS derivable from SIC data.

(Drawbridge slightly 

open.)

Almost 

comparable

Sales or receipts from SIC are within 3% of NAICS 

sales or receipts.

(Drawbridge open.) Not comparable NAICS sales or receipts cannot be estimated within 3% 

from SIC data.

Master menu and 

index 3-digit NAICS menu Data in formats for downloading PDF report
Source: 1997 Economic Census, Comparative Statistics 

Last modified: 7/19/00 

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