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CPT code 58100: Endometrial biopsy, without cervical dilation2026 Medicare rate & RVUs in Chicago, IL

Reports office or facility sampling of the uterine lining, with or without endocervical sampling, when the clinician does not dilate the cervix.

CMS RVU26DEffective Oct 1, 2026One payment locality53.9K Medicare services in 2024

In Chicago, IL, Medicare pays $107.82 for 58100 in the office and $64.51 when it’s performed in a hospital or facility.

$107.82Office (non-facility)
$64.51Hospital or facility
+9.8%vs the national office rate ($98.20)

Check a contract rate as a % of Medicare · 58100 nationwide

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

We’ll open 58100 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Chicago, IL
  2. What 58100 covers
  3. Compared with other areas
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Related codes
  8. Rate history
  9. Where it applies
  10. Billing questions
  11. Sources

What 58100 covers

A clinician obtains tissue from the uterine lining for evaluation, commonly for abnormal uterine bleeding, postmenopausal bleeding, or concern for endometrial hyperplasia or cancer. The sample may be collected by aspiration or another method, and endocervical sampling may be included. Gynecologists commonly perform this procedure in an office or outpatient facility, often using a narrow sampling device passed through the cervix without dilation.

Report the service when endometrial sampling is performed without cervical dilation; documentation should identify the indication, sampling performed, and method when relevant. The code has a 0-day global period, so same-day preoperative and postoperative care is included. When multiple procedures occur in the same session, the highest-valued procedure is paid in full and other procedures are subject to the standard 50% multiple procedure reduction. Modifier 50 is inappropriate. Medicare does not pay an assistant at surgery for this service; co-surgeons and team surgery are not permitted.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

How Chicago, IL compares for 58100

Across 109 of 109 payment localities, the office rate for 58100 runs from $87.50 in Arkansas to $122.16 in San Benito County, CA. Chicago, IL pays $107.82. The RVUs are the same everywhere; the geographic indexes change the dollars.

58100 in Chicago, IL vs other payment areas
  1. Chicago, IL · this page$107.82
  2. East St. Louis, IL · Illinois$101.17−$6.65
  3. Rest of Illinois · Illinois$97.64−$10.18
  4. Suburban Chicago, IL · Illinois$105.29−$2.53
  5. Los Angeles, CA · California$106.93−$0.89
  6. Washington, DC area · District of Columbia$110.33+$2.51
  7. Miami, FL · Florida$111.05+$3.23

Other areas in Illinois first, then benchmark localities. Bars start at $0.

Every other payment area

58100 in every other Medicare payment locality
Payment localityOfficeFacility
Manhattan, NYNew York$113.22$63.15
AlaskaAlaska$118.12$72.23
AlabamaAlabama$88.68$50.98
ArkansasArkansas$87.50$50.49
ArizonaArizona$95.58$53.83
Bakersfield, CACalifornia$101.18$53.95
Chico, CACalifornia$100.58$53.36
El Centro, CACalifornia$100.62$53.40

58100 rates by state

Office rate range in each state. Select a state to see its payment localities.

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

Explore a state

Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

$87.50

$118.12

Color shows the midpoint of each state’s locality range.

View every state and territory as a table
58100 office rate range by state
State / territoryOffice rate rangeLocalities
AK$118.121
AL$88.681
AR$87.501
AZ$95.581
CA$100.58–$122.1629
CO$100.451
CT$104.451
DC$110.331
DE$97.071
FL$99.45–$111.053
GA$93.95–$100.562
GU$102.341
HI$102.341
IA$89.571
ID$90.361
IL$97.64–$107.824
IN$90.811
KS$89.751
KY$91.861
LA$91.95–$96.102
MA$100.15–$109.092
MD$98.64–$110.333
ME$91.41–$95.142
MI$94.60–$101.202
MN$94.761
MO$90.87–$95.733
MS$89.171
MT$98.181
NC$92.201
ND$94.031
NE$89.851
NH$99.441
NJ$105.22–$109.442
NM$95.311
NV$97.081
NY$93.53–$116.525
OH$93.751
OK$91.091
OR$95.91–$102.782
PA$93.57–$102.382
PR$98.661
RI$99.901
SC$93.211
SD$93.541
TN$90.241
TX$93.04–$100.798
UT$94.381
VA$95.26–$110.332
VI$98.661
VT$94.221
WA$99.78–$110.642
WI$91.171
WV$94.441
WY$96.371

See 58100 in every payment locality

How the 58100 rate is calculated

Each of 58100’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

How the rate is built · 58100

RVUs × geographic indexes × conversion factor

Office or facility?

Work1.18

1.18 RVUs× 1.000 GPCI

Practice expense1.55

1.55 RVUs× 1.000 GPCI

Malpractice0.21

0.21 RVUs× 1.000 GPCI

Adjusted RVUs

2.9400

Conversion factor

$33.4009

Medicare rate

$98.20

Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.

The exact Chicago, IL inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

6,516

Code
58100
Physician work
1.18
Practice expense
1.55
Malpractice
0.21

GPCI2026.csv

48

Locality
Chicago, IL
Physician work
1.007
Practice expense
1.005
Malpractice
2.295
Office calculation for 58100 in Chicago, IL
ComponentRVULocality factorAdjusted
Physician work1.18× 1.0071.1883
Practice expense1.55× 1.0051.5577
Malpractice0.21× 2.2950.4819
Total RVUs3.2280
Conversion factor× 33.4009

Office rate, Chicago, IL$107.82

Office: (1.18 × 1.007 + 1.55 × 1.005 + 0.21 × 2.295) × $33.4009 = $107.82

Facility: (1.18 × 1.007 + 0.26 × 1.005 + 0.21 × 2.295) × $33.4009 = $64.51

Open 58100 in the RVU calculator

Payment rules and modifiers for 58100

The CMS indicators that decide how 58100 is paid alongside other services.

CMS payment indicators · 58100

Endometrial biopsy, without cervical dilation

RuleCMS valueWhat it means
Global period000Same-day global: pre- and post-op care on the day of the procedure is included.
Multiple procedures2Standard reduction: highest-valued procedure at 100%, others at 50%.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)1Not paid (statutory restriction).
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical0Physician service: no professional/technical split.

What modifiers do to the payment

Modifier 51 · payment effect

With and without the modifier

58100 without 51 · national office

$98.20

Endometrial biopsy, without cervical dilation

58100-51 · Second procedure: 50%

$49.10

When this isn’t the highest-valued procedure in the session, Medicare pays 50% of its fee schedule amount (the highest is paid at 100%).

When to use modifier 51

Codes related to 58100

Related codes aren’t interchangeable: bill the code that matches the service performed.

Codes related to 58100
CodeHow it relatesOffice range, Chicago, IL
Used instead
58110Endometrial biopsy, performed with colposcopyFor endometrial sampling performed with colposcopy; it is an add-on to the applicable primary procedure.$57.44
58120Dilation and curettage, diagnostic or therapeutic, nonobstetricDescribes dilation and curettage rather than sampling without cervical dilation.$328.00
Often billed with
57500Cervical biopsy, tissue sampling or lesion excisionMay be reported for a separately performed biopsy of a cervical lesion.$161.19

How 58100 has changed in Chicago, IL

58100 · Office / nonfacility

$107.82

Effective 2026-10-01

The base rate is $2.41 higher than on 2025-10-01, moving from $105.41 to $107.82 (2.3%).

It is unchanged from the immediately preceding available release, effective 2026-07-01.

Base rate by release · bars start at $0 · select a bar to compare

One bar per available release, ordered by effective date. Missing rates remain gaps. These comparisons hold the code, setting and locality identifiers constant; they do not isolate which policy or input caused a change.

What changed, release by release

  1. January 1, 2026

    RVU26A

    $105.41changed to$107.82

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 1.21 changed to 1.18
    • Practice expense RVU 1.60 changed to 1.55
    • Malpractice RVU 0.20 changed to 0.21
    • Practice expense GPCI 1.023 changed to 1.005
    • Malpractice GPCI 2.018 changed to 2.295

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $110.18changed to$105.41

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 1.65 changed to 1.60

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $108.38changed to$110.18

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $112.00changed to$108.38

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 1.66 changed to 1.65
    • Malpractice RVU 0.19 changed to 0.20
    • Work GPCI 1.009 changed to 1.007
    • Practice expense GPCI 1.033 changed to 1.023
    • Malpractice GPCI 1.945 changed to 2.018

  5. January 1, 2023

    RVU23A

    $115.26changed to$112.00

    • Conversion factor 34.6062 changed to 33.8872
    • Malpractice RVU 0.20 changed to 0.19
    • Work GPCI 1.011 changed to 1.009
    • Practice expense GPCI 1.044 changed to 1.033
    • Malpractice GPCI 1.871 changed to 1.945

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $114.03changed to$115.26

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 1.60 changed to 1.66

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $109.57changed to$114.03

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 1.40 changed to 1.60
    • Malpractice RVU 0.19 changed to 0.20
    • Work GPCI 1.009 changed to 1.011
    • Practice expense GPCI 1.039 changed to 1.044
    • Malpractice GPCI 1.898 changed to 1.871

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $102.06changed to$109.57

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 1.28 changed to 1.40
    • Malpractice RVU 0.15 changed to 0.19
    • Work GPCI 1.008 changed to 1.009
    • Practice expense GPCI 1.034 changed to 1.039
    • Malpractice GPCI 1.925 changed to 1.898

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $119.31changed to$102.06

    • Conversion factor 35.9996 changed to 36.0391
    • Work RVU 1.53 changed to 1.21
    • Practice expense RVU 1.36 changed to 1.28
    • Malpractice RVU 0.19 changed to 0.15

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $120.32changed to$119.31

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 1.38 changed to 1.36
    • Work GPCI 1.012 changed to 1.008
    • Practice expense GPCI 1.036 changed to 1.034
    • Malpractice GPCI 1.972 changed to 1.925

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $120.26changed to$120.32

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 1.37 changed to 1.38
    • Work GPCI 1.016 changed to 1.012
    • Practice expense GPCI 1.037 changed to 1.036
    • Malpractice GPCI 2.019 changed to 1.972

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $120.69changed to$120.26

    • Conversion factor 35.9335 changed to 35.8043

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $120.09changed to$120.69

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $125.27changed to$120.09

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 1.36 changed to 1.37
    • Malpractice RVU 0.25 changed to 0.19
    • Work GPCI 1.023 changed to 1.016
    • Practice expense GPCI 1.044 changed to 1.037
    • Malpractice GPCI 2.048 changed to 2.019

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $125.27changed to$125.27

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 1.49 changed to 1.36
    • Malpractice RVU 0.26 changed to 0.25
    • Work GPCI 1.030 changed to 1.023
    • Practice expense GPCI 1.051 changed to 1.044
    • Malpractice GPCI 2.077 changed to 2.048

    Held through RVU14B, RVU14C, RVU14D.

  16. October 1, 2013

    RVU13D

    No ratechanged to$125.27

  17. January 1, 2013

    RVU13AR

    Earliest loaded release: No rate

    Held through RVU13B, RVU13C.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$107.82$64.51RVU26D
2026-07-01$107.82$64.51RVU26C
2026-04-01$107.82$64.51RVU26B
2026-01-01$107.82$64.51RVU26A
2025-10-01$105.41$68.35RVU25D
2025-07-01$105.41$68.35RVU25C
2025-04-01$105.41$68.35RVU25B
2025-01-01$105.41$68.35RVU25A
2024-10-01$110.18$70.34RVU24D
2024-07-01$110.18$70.34RVU24C
2024-04-01$110.18$70.34RVU24B
2024-03-09$110.18$70.34RVU24AR
2024-01-01$108.38$69.19RVU24A
2023-10-01$112.00$70.70RVU23D
2023-07-01$112.00$70.70RVU23C
2023-04-01$112.00$70.70RVU23B
2023-01-01$112.00$70.70RVU23A
2022-10-01$115.26$72.26RVU22D
2022-07-01$115.26$72.26RVU22C
2022-04-01$115.26$72.26RVU22B
2022-01-01$115.26$72.26RVU22A
2021-10-01$114.03$72.86RVU21D
2021-07-01$114.03$72.86RVU21C
2021-04-01$114.03$72.86RVU21B
2021-01-01$114.03$72.86RVU21A
2020-10-01$109.57$74.32RVU20D
2020-07-01$109.57$74.32RVU20C
2020-04-01$109.57$74.32RVU20B
2020-01-01$109.57$74.32RVU20A
2019-10-01$102.06$78.58RVU19D
2019-07-01$102.06$78.58RVU19C
2019-04-01$102.06$78.58RVU19B
2019-01-01$102.06$78.58RVU19A
2018-10-01$119.31$96.98RVU18D
2018-07-01$119.31$96.98RVU18C
2018-04-01$119.31$96.98RVU18B
2018-01-01$119.31$96.98RVU18AR1
2017-10-01$120.32$98.02RVU17D
2017-07-01$120.32$98.02RVU17C
2017-04-01$120.32$98.02RVU17B
2017-01-01$120.32$98.02RVU17A
2016-10-01$120.26$97.98RVU16D
2016-07-01$120.26$97.98RVU16C
2016-04-01$120.26$97.98RVU16B
2016-01-01$120.26$97.98RVU16A
2015-10-01$120.69$98.33RVU15D
2015-07-01$120.69$98.33RVU15C
2015-04-01$120.09$97.85RVU15B
2015-01-01$120.09$97.85RVU15A
2014-10-01$125.27$103.58RVU14D
2014-07-01$125.27$103.58RVU14C
2014-04-01$125.27$103.58RVU14B
2014-01-01$125.27$103.58RVU14A
2013-10-01$125.27$102.03RVU13D
2013-07-01Rate data unavailableRate data unavailableRVU13C
2013-04-01Rate data unavailableRate data unavailableRVU13B
2013-01-01Rate data unavailableRate data unavailableRVU13AR

Price 58100 for an earlier date of service

Where the Chicago, IL rate applies

Chicago, IL is a Medicare payment area, not a city. Our Census mapping connects it to 137 cities and communities in Illinois. Some span more than one payment area; confirm with the service ZIP.

Browse all communities in Illinois

58100 billing questions

When should this code be chosen over 58120?

Use 58100 for endometrial sampling without cervical dilation. Code 58120 describes dilation and curettage, rather than sampling without dilation.

Can endocervical sampling be included?

Yes. The service may include endocervical sampling along with the uterine lining sample; document which tissue was obtained.

Should modifier 50 be appended for sampling both sides?

No. The CMS bilateral adjustment does not apply, and modifier 50 is inappropriate for this service.

What documentation supports reporting 58100?

Document the clinical reason for sampling, that endometrial tissue was obtained, and that cervical dilation was not performed. Record any endocervical sampling as well.

How does the 0-day global period affect same-day care?

Same-day preoperative and postoperative care is included in the procedure's payment.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Show the CMS file lines behind this rate
RVUs for 58100PPRRVU2026_Oct_nonQPP.csv, line 6,516 (RVU26D)
Geographic factors for Chicago, ILGPCI2026.csv, line 48 (RVU26D)

Open CMS sourceHow we calculate rates

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