CMS Price Transparency Data
Blood test, magnesium
Facility: Boston Children's Hospital
Billing Code: 83735 (CPT)
The BaseRate · fair price high confidence
A fair price for this
$21
about 3.0× the $7 Medicare rate · typically $9–$25
modeled estimate · not a bill or quote
Medicare pays $7 Fair price $21 Cash price $119 Hospital's list price $119
What each insurance company pays
Which insurers have negotiated a price with this hospital for this procedure — and which haven’t.
5 of 6 major insurers have a published price at this hospital
✓ UnitedHealthcare✓ Blue Cross Blue Shield✓ Aetna✓ Cigna✓ Humana Kaiser Permanente
Crossed out = this hospital hasn’t published a negotiated price for that insurer for this procedure. It doesn’t necessarily mean they aren’t accepted — ask your insurer.
| Insurance company | Price range | vs. Medicare |
|---|---|---|
| UnitedHealthcaremajor | $69 - $104 | 1030% |
| Blue Cross Blue Shieldmajor | $24 - $81 | 358% |
| Aetnamajor | $69 - $102 | 1030% |
| Cignamajor | $98 - $110 | 1463% |
| Humanamajor | $104 - $110 | 1552% |
| Ambetter (Centene) | $73 - $77 | 1090% |
| CDPHP | $56 - $104 | 836% |
| Harvard Pilgrim | $58 - $82 | 866% |
| Tufts Health Plan | $71 - $75 | 1060% |
| UniCare | $27 | 403% |
| + 8 smaller / regional plans | $70 - $110 |
Excludes 2 rental-network / third-party entries (e.g. Multiplan, PHCS) — these are pricing networks, not insurers.
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Other Procedures at Boston Children's Hospital
Compare: Blood test, magnesium at other MA hospitals
- UMass Memorial Healthalliance Hospitals · Leominster $7
- UMass Memorial Health - Harrington Hospital · Southbridge $7
- Holyoke Medical Center · Holyoke $7
- Boston Medical Center · Boston $7
- Boston Medical Center-Brighton · Brighton $7
- Southcoast Hospitals Group · Fall River $7
- Milford Regional Medical Center · Milford $7
- Good Samaritan Medical Center · Brockton $7
Insurance negotiated median for the same procedure, sorted lowest first.